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MGB GT OR MGC GT REAR LEAF SPRINGS?

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11400 Silver Member jeff p
Rockville, MD, USA   USA
1968 MG MGB GT "Pearl"
1972 MG MGB "Winston"
Originally posted this in MGB & GT forum...got no input. Anyone in MGC forum have any advice?


My 1968 MGB GT rear leaf springs need to be replaced (center of hub to side molding 12"...). The replacement options from Moss & VB include several 7 leaf springs...

In Moss catalog they show 7 leaf springs with 110 lb spring rate with different part numbers for MGB GT's CB and RB (I assume RB sits higher than CB) and another part number for MGC GT's with no spring rate listed.

In VB catalog they show 7 leaf springs for MGB GT for CB (65-74.5), and for MGC (but does not specify roadster or GT)...both with 7 leafs, no spring rates specified.

Somewhere I read that the MGC springs have an asymmetric design.

Has anyone tried MGC GT rear leaf springs on a MGB GT?

Any comments on the design differences between MGB and MGC springs?

Anyone know if the VB MGC springs will fit an MGB GT?

Anyone know the spring rate of the VB MGC springs (they do not appear to have technical support)?

The VB MGC springs are about 1/2 the price of the VB MGB GT springs and about 70% less than Moss MGC GT springs.

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ateichert Michael J
Orangevale, CA, USA   USA
1968 MG MGB GT "Little Blue"
I too have a 68 MGBGT and recently replaced my rear springs with new ones from Moss. My ride height was 14.24" before. After replacement it was 16.25". Also the ride was so harsh I could not keep the inside mirror sucker cup attached to the windscreen. I did not like the look of the car so I reinstalled the old ones. The reason for the first swap was that the springs were used and off of a MGCGT and given to me a few years ago and installed then. I always though they might be sagging a bit hence the swap. Has anybody out there replaced springs lately and who's did you use?

kirks-auto Platinum Member Robert Kirk
Davenport, IA, USA   USA
I offer parabolic which several customers like.

https://www.moss-europe.co.uk/parabolic-springs-rear-mgb-gt.html



Regards,
Robert Kirk

kirkbrit@yahoo.com
E-mail PLEASE for quote/questions/orders

Business phone 563 323 1017
cell 563 940 1864

http://kirks-auto.com/
Moss distributor/UK importer
Beat or match any retail/delivered quote


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Parts for your classic British and Italian car. 30 years in business.
JMA Avatar
JMA John Anderson
Donvale, Victoria, Australia   AUS
Jeff,

I'm not aware of the MGC's springs being asymmetric and should be interchangable with the MGB.

As far as spring rates for the MGC is concerned, I don't know the number but the ride on mine is horrible. If I hit a bump mid corner the back steps out several inches at low speed, for this reason I'm fitting parabolic rear springs so I'm not fighting the rear end. MGOC Spares in the UK told me to use the MGB GT parabolic rear springs for the MGC, but so far I can't comment how the car sits or how it drives as it isn't moving under its own power at the moment.

John

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geezer Avatar
geezer Silver Member charles durning
Magee, MS, USA   USA
1958 MG Magnette ZB "Chick Magnette (sold)"
1967 Morris Minor 1000 Saloon (2-door) "Marvin"
1974 MG MGB GT
Not sure what rear springs I have on my CBB GT but I like them. They are 5 leaf and the ride height is 13.5" center wheel to bottom of chrome strip. They may be early roadster springs. My front springs are 380 lb early roadster springs, ride height is 12.5" center of wheel to chrome strip. The ride is great as a cruiser and the car is planted in the corners when driven vigorously. There is no bottoming out with 2 folks and suitcases.

Though I have not tried them on a MGB, I do like parabolic springs. They are a good compromise. For my money I would avoid stiffer springs unless you lake a harsh ride or carry heavy loads.



Who's version of right are we talking about? When you get 10 LBC owners in a room you'll get 12 different answers.

kirks-auto Platinum Member Robert Kirk
Davenport, IA, USA   USA
MGB and MGC springs are NOT the same. Each model has two different springs dependent on open or closed (GT) cars.



Regards,
Robert Kirk

kirkbrit@yahoo.com
E-mail PLEASE for quote/questions/orders

Business phone 563 323 1017
cell 563 940 1864

http://kirks-auto.com/
Moss distributor/UK importer
Beat or match any retail/delivered quote


Member Services:
Parts for your classic British and Italian car. 30 years in business.
jsrivard Avatar
jsrivard Silver Member Joel Rivard
Ramstein, Rheinland-Pfalz, Germany   DEU
1968 MG MGC GT "Maggie"
If the actual metal isn't fatigued past its useful life they aren't too difficult to refurbish.





Cheers,
Joel

MGC Life Blog: https://mgc.is-great.net/
MGC "how-to's" available on YouTube: https://www.youtube.com/channel/UCDMf5tRcUOG0ueyizruhv5w/

JMA Avatar
JMA John Anderson
Donvale, Victoria, Australia   AUS
Robert,

I appreciate that there are different part numbers for each of the cars, but is this just due to different spring rates or different design as Jeff has asked?

If the difference is the spring rate then I'm okay, if it's due to a different design then I'm screwed.

John

TennMGC Avatar
TennMGC Silver Member Matt Carden
Nashville, TN, USA   USA
1968 MG MGC
Cap'n Kirk,

A see your link to parabolic from Amos UK for MGB. What do you propose for my 68 C roadster.

Matt
Nashville

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kirks-auto Platinum Member Robert Kirk
Davenport, IA, USA   USA
The B and C springs are the same other than the torsion rates. An MGB GT parabolic is close to an MGC roadster



Regards,
Robert Kirk

kirkbrit@yahoo.com
E-mail PLEASE for quote/questions/orders

Business phone 563 323 1017
cell 563 940 1864

http://kirks-auto.com/
Moss distributor/UK importer
Beat or match any retail/delivered quote


Member Services:
Parts for your classic British and Italian car. 30 years in business.
MGC03L Avatar
MGC03L Steve Lumley
Sydney, NSW, Australia   AUS
1969 MG MGC
i can vouch for these parabolic springs after having unsatisfactory result with a few sets of traditional springs on my C Roadster where they seemed to collapse after too few miles.
The parabolics have been great, nice ride height, always get comments on how the car sits on the road. Had them for a few years now and no visible sag. I also have tramp rods fitted, which gave an unexpected advantage of straightening the body on the chassis where previously the gaps on the rear guards were completely different one side to the other. The result was a bigger size tyre.

One issue I found with the old springs was that there is no obligation on the maker to label where they are made or the spec. so you are probably buying a pretty basic product.

Back Rob on this one, parabolics are great!

Steve

kirks-auto Platinum Member Robert Kirk
Davenport, IA, USA   USA
In reply to # 3738925 by MGC03L

One issue I found with the old springs was that there is no obligation on the maker to label where they are made or the spec. so you are probably buying a pretty basic product.

Back Rob on this one, parabolics are great!

Steve

There is some myth about who makes the springs. One song goes, employees of the defunct OEM UK based factory were going to recommission the factory, that from a rep of the largest retail parts specialist in the world. He later denied my claim. Shortly after the OEM supply were sold out an Asian manufacturer took over and that has been a principle issue ever since. Spring steel is not high grade but it does require sufficent carbon to hold its tension. Often as Steve says, the arch disappears within days or weeks and you leaving you with essentially the same issue you had hoped to correct.

I can only speak of the USA but the leaf widths are not common in the trade. So even having replacement built at a local trailer of truck spring maker is impossible even the spring keepers are not easily chased. I suspect in Europe that maybe less of an issue and possibly in AU.



Regards,
Robert Kirk

kirkbrit@yahoo.com
E-mail PLEASE for quote/questions/orders

Business phone 563 323 1017
cell 563 940 1864

http://kirks-auto.com/
Moss distributor/UK importer
Beat or match any retail/delivered quote


Member Services:
Parts for your classic British and Italian car. 30 years in business.
JMA Avatar
JMA John Anderson
Donvale, Victoria, Australia   AUS
Robert,

Unfortunately in Australia both Ford and GM pulled out of manufacturing cars here which meant that it was unviable for Toyota to continue. Ford closed up in 2016, GM and Toyota last year.

Apart from caravan and small trailer companies, Ford was the last auto manufacturer to use leaf springs and they were only on a very small range of a few hundred a year, I suspect the springs were imported from China or India.

The main issue here is that there were once a lot of spring works who could make or retemper the leaves but now very few remain, I have seen some cars with retempered spings and they look like they're ready to go off road. The trick is to find a place that actually knows what they're doing and has staff old enough with the experience. Which is a lot easier said than done unfortunately.

John

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