MG Engine Swaps Forum

Welcome! Sign In Register

Please Sign In or Register to Search

Best Modified MGB V6 Rear-End

Posted by maggardmd

Want to advertise your business in this space? Click here for more information!

Page 1 of 3 12 3

Topic List Forum List Newer Older Start New Topic

Best Modified MGB V6 Rear-End #1
maggardmd Mark Maggard Hope Hull, Alabama, USA 1977 MG MGB V6 Conversion	Posted: June 25, 2012 10:04AM Registered: 5 years ago Posts: 95

Gentlemen,
It is time for me to invest in a modified rear end to handle torque of the 3400 V6.
I have destroyed 3 standard MGB rear ends.
I am running 3400L SFI V6 FWD engine bolted to a WC T5 with 2.95 first, 0.063 fifth.
Also using G-Force Clutch set-up. Have gotten weight down to 1950 lbs. Would like a light weight Limited slip with a variety of gears available.

I know this topic has been discussed over and over. I am sorry fo asking again for your knowledge. But i am unable to find satisfactory info in the search library.

I am asking for what has worked for you guys.
Thanks a Million,
Mark

Sponsored Links. You can hide this ad & support this site by upgrading to a Gold Membership ~ click here for more info.

Reply Quote

Re: Best Modified MGB V6 Rear-End #2
260mgb Jim Nichols Sequim,WA, USA	Posted: June 25, 2012 11:11AM Registered: 5 years ago Posts: 1,352

Mark, Do a Search on Ford Ranger 7.5. 83-92 offset rear end,use 2 short axles and narrow long tube. Can use Mustang rear discs. Comes out 53". If you eliminate C clips,cut 1/2" off axle ends and use small 9" ends end up 52". Trey on this site found a 3.08. 3.45 are common. You can use a factory limited slip,Tru-Trac gear type or 4x4 locker.

Reply Quote

Re: Best Modified MGB V6 Rear-End #3
cgill Chris Gill Salmon Arm, British Columbia, Canada 1971 MG MGB GT 1979 MG MGB "BOPR V8 Conversion"	Posted: June 25, 2012 12:12PM Registered: 6 years ago Posts: 2,832

I have the Ford Range 7.5 in mine and it seems to work well. Jim is a wealth of information on how to modify it...well actually, he's a wealth of information for just about anything modified on a B!

My other obsession...photography!

http://www.flickr.com/photos/77646803@N00/

Sponsored Links. You can hide this ad & support this site by upgrading to a Gold Membership ~ click here for more info.

Reply Quote

Re: Best Modified MGB V6 Rear-End #4
BMC Brian Mc Cullough Minneapolis, Minnesota, USA 1959 Austin A40 Farina 1959 Austin-Healey Frogeye (Bugeye) 1961 Austin-Healey Sprite MkII "Green Sprite" 1969 MG MGC GT "CGT" 1979 MG MGB → more	Posted: June 25, 2012 02:26PM Registered: 13 years ago Posts: 4,342

Mark,

I'm not sure if you are asking for best ratio or best type to convert.

Many things go into ratio including what your rev range is, what your driving style is and what the car is mostly used for- highway and top end on the race track might be a bit different from stop light to stop light with autocross mixed into the bunch.

Personally, my 3.4L with 2.95 1st and either a 0.63 or 0.68 5th can pull the 3.42:1 rear end gear ratio okay but i am going to 3.76 1st gear with a 0.72 overdrive.

I have built cars with 3.73:1 rear end gear ratio with the same T5 ratios that you and i both currently have.

I do not like driving cars with a 3.08:1 rear end and the same V8 T5 ratios that you and i have. Too high of 1st gear and all gears are too close for that total combo.

If I wanted to keep a 2.95 1st gear, I would leave my car with a little more power on takeoff with a 3.5-3.7 rear end ratio.

GM and Ford rear axles have good build qualities and parts availability.

-BMC.

How to advertise on this website

BMC British Automobile – Minneapolis, MN USA BMC British Automobile is a Restoration and Repair shop north of Minneapolis, Minnesota. Our time is spent solely on British vehicles and British Conversions. MG and Austin are our specialties.

Reply Quote

Re: Best Modified MGB V6 Rear-End #5
bills Bill Spohn W. Vancouver, BC, Canada 1956 MG MGA 1958 MG MGA Twin-Cam 1962 MG MGA MkII Coupe 1965 Jensen CV8 1969 Lamborghini Countach → more	Posted: June 25, 2012 03:47PM Registered: 8 years ago Posts: 9,135

In reply to # 2103024 by maggardmd I have destroyed 3 standard MGB rear ends.

How, Mark? Are you a drag racing start kind of guy? If not, it would surprise me that normal use would kill the fairly durable stock late model MGB diff.

Bill Spohn www.rhodo.citymax.com/carstuff.html
1958 MGA Twincam (race car), 1962 MGA Deluxe Coupe
1969 MGC roadster, 1957 Jamaican MGA
1965 Jensen CV8, 1971 Jensen Interceptor
1969 Lamborghini Islero S, 1988 Fiero GT turbo
2009 Pontiac Solstice GXP Coupe
West Vancouver BC

Reply Quote

Re: Best Modified MGB V6 Rear-End #6
rficalora Rob rficalora Cypress, TX, USA 1976 MG MGB V8 Conversion "MG MUTT"	Posted: June 25, 2012 06:52PM Registered: 7 years ago Posts: 1,678

I'm surprised you're breaking the rear axle too - especially if the car is 1950lbs. Plenty of folks run the stock rear end with V6's & even V8's. Typically folks swap them to get better gear ratios.

Sponsored Links. You can hide this ad & support this site by upgrading to a Gold Membership ~ click here for more info.

Reply Quote

Re: Best Modified MGB V6 Rear-End #7
NOHOME Peter Plouf London, Canada 1961 Austin-Healey Sprite Bugeye "Lil" 1967 MG MGB GT "Maggie (GT From Hell)"	Posted: June 26, 2012 09:03AM Registered: 6 years ago Posts: 11,867

Bit concerned if you are killing stock rear axles. The lighter options mentioned are not going to be much beefier in the bearing or gear department. Are you going to need a 9" ford to keep you in one piece?

Reply Quote

Re: Best Modified MGB V6 Rear-End #8
maggardmd Mark Maggard Hope Hull, Alabama, USA 1977 MG MGB V6 Conversion	Posted: June 26, 2012 10:14AM Registered: 5 years ago Posts: 95

In reply to # 2103363 by bills

In reply to # 2103024 by maggardmd I have destroyed 3 standard MGB rear ends.

How, Mark? Are you a drag racing start kind of guy? If not, it would surprise me that normal use would kill the fairly durable stock late model MGB diff.

I too was under the impession the stock 3.9 would hold up since it was original truck diff.
The weakest area of the diff is the "Spider Gears". When they explode the entire diff is trash!

It is true i like to "LAUNCH" of the line from time to time but there is so much wheel spin in 1st and 2nd that i don't see a lot of force beging applied to the diff because of "sliding friction vs static friction".

Well i guess i am wrong because i have created 3 great "boat anchors" with that thought.

Reply Quote

Re: Best Modified MGB V6 Rear-End #9
maggardmd Mark Maggard Hope Hull, Alabama, USA 1977 MG MGB V6 Conversion	Posted: June 26, 2012 10:31AM Registered: 5 years ago Posts: 95

In reply to # 2103280 by BMC Mark,

I'm not sure if you are asking for best ratio or best type to convert.
Personally, my 3.4L with 2.95 1st and either a 0.63 or 0.68 5th can pull the 3.42:1 rear end gear ratio okay but i am going to 3.76 1st gear with a 0.72 overdrive.

I have built cars with 3.73:1 rear end gear ratio with the same T5 ratios that you and i both currently have.

If I wanted to keep a 2.95 1st gear, I would leave my car with a little more power on takeoff with a 3.5-3.7 rear end ratio.

GM and Ford rear axles have good build qualities and parts availability.

-BMC.

Brian,
I have both 2.95 and 3.76 trannys like you. Why are you changing to the 3.76?
Also which GM or Ford diff would you recommend?
Are you still in the business of bulding custom rear-ends?

Mark

Reply Quote

Re: Best Modified MGB V6 Rear-End #10
98chrysler Jeremy Mulder Dallas TX, USA 1975 MG Midget Conversion	Posted: June 26, 2012 11:48AM Registered: 2 years ago Posts: 480

I did a Ford 7.5 in my Midget. I used a '99 Mustang unit with a trac-loc and disc brakes. There is a lot of aftermarket support for the 7.5 and the 8". I had Mosier engineering make the axles which are supposed to be 20-30% stronger than stock. The Mustang guys I spoke with said the 7.5 is good for around 3-400 or so and the 8" up to 1000 with mods. I run the 2.73 set for fuel mileage.

My fuel injected MG Midget Project
Sorry folks, I do not battle the keyboard warriors, or feed the trolls!

Edited 1 time(s). Last edit at 07/01/2012 03:40PM by 98chrysler.

Reply Quote

Re: Best Modified MGB V6 Rear-End #11
260mgb Jim Nichols Sequim,WA, USA	Posted: June 26, 2012 11:52AM Registered: 5 years ago Posts: 1,352

Mark, You can find a 90-92 Ranger 8.8 out of a 4.0 V6 pickup and do the same narrowing one side trick. Actually the 7.5 and 8.8 28 spline axles are the same. If you want to eliminate the spider gears use a 4X4 locker from Spartan,Aussie or Lock-Rite.

Reply Quote

Re: Best Modified MGB V6 Rear-End #12
1744 Bill Guzman California, USA 1973 MG MGB GT "Green GT" 1974 MG MGB "Punking"	Posted: June 26, 2012 12:33PM Registered: 7 years ago Posts: 4,818

Either 7.5 Ford or GM differential will work. If cut then go for the narrow 51" this will allowed the use of wider wheels and tires.
The red B has a 8" Ford 51" wide hub to hub and wider wheels and tires. The 8" Ford has drums brakes, great choice but harder to find.
The Orange B has a 7.5 Ford Mustang differential with 52" stock hub to hub.
Ford Ranger is the same, some come with the 3.73 final drive gear set with posi traction if they have the towing package.

Gear sets are inexpensive for either about $170.

It is our attitude that will determine the outcome

How to advertise on this website

Classic Conversions Engineering MG Classic Conversions V6. Wilwood brake dealer.

Reply Quote

Attachments:

wheels 001.jpg (36.5 KB) –

wheels 002.jpg (38.8 KB) –

Please Sign In or Register to view additional attachments.

Re: Best Modified MGB V6 Rear-End #13
1744 Bill Guzman California, USA 1973 MG MGB GT "Green GT" 1974 MG MGB "Punking"	Posted: June 26, 2012 12:49PM Registered: 7 years ago Posts: 4,818

This is a differential from a Camaro which is the same as the S-10 which it has less brackets to cut.
I choose this one due to the rear disc brakes 3.23 posi traction.

Cut axles from Moser $275, differential $125, cut the housing $250, bearing kit, seal kit including the axle bearings around $200.
No need to take chances if you are going to drive the B.

It is our attitude that will determine the outcome

How to advertise on this website

Classic Conversions Engineering MG Classic Conversions V6. Wilwood brake dealer.

Reply Quote

Attachments:

CCBCC Memorial weekend run 003.jpg (35.2 KB) –

Please Sign In or Register to view additional attachments.

CCBCC Memorial weekend run 009.jpg (39.1 KB) –

Please Sign In or Register to view additional attachments.

Re: Best Modified MGB V6 Rear-End #14
1744 Bill Guzman California, USA 1973 MG MGB GT "Green GT" 1974 MG MGB "Punking"	Posted: June 26, 2012 12:52PM Registered: 7 years ago Posts: 4,818

differences between the 8 inch Ford and the stock rear end.

It is our attitude that will determine the outcome

How to advertise on this website

Classic Conversions Engineering MG Classic Conversions V6. Wilwood brake dealer.

Reply Quote

Attachments:

4 link suspension Red Project 003.jpg (42.3 KB) –

Please Sign In or Register to view additional attachments.

4 link suspension Red Project 009.jpg (48.9 KB) –

Please Sign In or Register to view additional attachments.

8 Ford Ddifferential 005.jpg (45.1 KB) –

Please Sign In or Register to view additional attachments.

Re: Best Modified MGB V6 Rear-End #15
1744 Bill Guzman California, USA 1973 MG MGB GT "Green GT" 1974 MG MGB "Punking"	Posted: June 26, 2012 05:27PM Registered: 7 years ago Posts: 4,818

This is the differential that went into my RD. It is a Ford Mustang 7.5 with Willwood rear brake kit.
BTW the rear brake kits are available at CCE for GM or Ford.

It is our attitude that will determine the outcome

How to advertise on this website

Classic Conversions Engineering MG Classic Conversions V6. Wilwood brake dealer.

Reply Quote

Attachments:

Bill Guzman's Pictures.jpg (44 KB) –

Please Sign In or Register to view additional attachments.

Re: Best Modified MGB V6 Rear-End #16
tdecell Trey Decell Clinton, Mississippi, USA 1974 MG MGB 1974 MG MGB GT	Posted: June 27, 2012 07:46AM Registered: 6 years ago Posts: 1,656

I've got a 7.5" Ford to put in the GT when it's done. The reason I went with a 3.08 is that I've got a V6 T5 trans, If I can come across a V8 trans, I can always swap gearsets. The Mustang disc brakes were a very easy swap, found the "how to" on a Ranger forum.

Blog-
www.tdecell.blogspot.com

Reply Quote

Re: Best Modified MGB V6 Rear-End #17
rkassed randy kassed baton rouge, USA 1972 MG MGB GT V8 Conversion	Posted: June 27, 2012 09:25AM Registered: 1 year ago Posts: 156

Hey Jim, I am interested in narrowing a 7.5 for my car also and what you mention seems to be the easiest way of going about it. When you say use the 9" end what do you mean? Also do you have a link to the thread that this info appeared on? Ive been trying to figure out what rear end to swap into my gt. thanks,
Randy

Reply Quote

Re: Best Modified MGB V6 Rear-End #18
260mgb Jim Nichols Sequim,WA, USA	Posted: June 27, 2012 11:28AM Registered: 5 years ago Posts: 1,352

You can buy the small 9" axle tube ends from Strange,Moser and Currie. NOT the C clip eliminator which are prone to leak and meant for drag race only. The bearing and lock ring have to be bored(honed).020 and pressed on the axle. They replace the stock axle tube ends that would be cut off. The ends of the axles are cut off 1/2" to eliminate the C Clips and shorten. You can reuse your old spring pads or buy new early Jeep CJ 1 3/4" replacements. I don't know if Trey is doing the ends but hope he documents his work including the disc brake conversion. When I have time I hope to do two axles, one for the MGB and one for the Alpine.

Edited 1 time(s). Last edit at 06/27/2012 04:41PM by 260mgb.

Reply Quote

Re: Best Modified MGB V6 Rear-End #19
supernatural jean gagne st. andrews, new brunswick, Canada	Posted: June 28, 2012 12:31PM Registered: 3 years ago Posts: 216

Mark, you may want to consider the installation of a QWAIFE diff. You can fit any "B" gears that you want and you will never break it, never. It's warranted for life even if you race. I put 330 ft/lb through mine without problems. As for the axle shafts, we raced an E/P "B" for ten years and they never broke. I will grant you that when we retired the car the splines were a bit twisted.

You are unlikely to ever put the punishment that a race car serves on the differential and axles with a 3.4

Jean Gagne
St. Andrews, New Brunswick

Reply Quote

Re: Best Modified MGB V6 Rear-End #20
rkassed randy kassed baton rouge, USA 1972 MG MGB GT V8 Conversion	Posted: June 28, 2012 01:59PM Registered: 1 year ago Posts: 156

Jim, I am assuming you are talking about the bearing housings? like these... http://www.ebay.com/itm/9-Ford-Big-Ford-New-Style-3-8-Torino-Housing-Bearing-Ends-NEW-/370625777121?pt=Motors_Car_Truck_Parts_Accessories&hash=item564b048de1&vxp=mtr if so the ford 7.5 takes the same size bearings as the 9"?
Randy

Reply Quote

Page 1 of 3 12 3

Topic List Forum List Newer Older Start New Topic

RSS

Add your reply here, or post your own questions!

Members Sign In if you've already registered, or
Register a New Account
Registration is free and takes less than a minute

MGB & GT · MG Midget · Buy, Sell & Trade · Vendor & Group Buy · MG Engine Swaps · Original MG · MGA · MGC · MG Magnette · 1100 & 1300 · T-Series & Prewar · Modern MGs · MG Motorsports · MG-2013 Event · Member Meetup · Other Vehicles · Off Topic · Clubs

Having trouble posting or changing forum settings?
Check the Forum Help File (FAQ) or contact the webmaster.
View the archived version of this thread.
Built using Phorum Open Source Software

The MG Experience

www.mgexp.com

MG Engine Swaps Forum

Best Modified MGB V6 Rear-End

Add your reply here, or post your own questions!Members Sign In if you've already registered, orRegister a New AccountRegistration is free and takes less than a minute

Join Our Club

MGExp Menu

—

Adjust Text Size

More to Explore

Add your reply here, or post your own questions!

Members Sign In if you've already registered, or
Register a New Account
Registration is free and takes less than a minute