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MG MGB Technical - rear axle strength

When do we need to consider rear axle conversions in terms of strength? I am still mulling over ideas, and past threads tend to suggest the standard set up of the MGB rear axle can handle the rover V8 in standard form, ie 193 lbs ft at 2900rpm? Albeit the ratios might not be the best. I can help the urge to take on an engine conversion project Yes I know, was I not going to supercharge? I just can't decide! ) Mike
J.M. Doust

Run the rear axle till it breaks. I have friends with MG v8's and the TR7 conversion. In both you will find little joy in first gear but the axle will last if your not a over zealous right foot. Eventually the bug will bite again and you will look for a suitbale replacement. Either diff centre like the quaife, new gearset 3.07 is now available again or complete shortened axle like ford 8". Plenty in the archives and still plenty of ford axles in the wreckers that you can be spring pdestals and brakes made to fit.
A J Ogilvie

Stock rear axle with 10 years on Rover 3.5 conversion T5 tranny from a V8 Camaro. I have run it up at our local drag strip many times and the only thing I have had to replace is the MGB U joint on the drive shaft.


MGBV81

Great News A J Ogilvie and MGBV8I, I am now begining to consolidate my plans. And u say Ford 8" shortened axle right. Thanks folks Mike
J.M. Doust

No probs with strength, it's the same unit as the V8 but with 3.07 : 1 CW & P. BUT DO upgrade the oil to at least Hypoid B.
Allan Reeling

Dont' forget the propshaft for the factory MGBGTV8 (140-odd ftlbs torque)was from a B but made stronger with heavier guage tubing to take the extra torque. Also the tube axle was claimed to be torsionally more rigid than the banjo. The factory V8 engine was also detuned to produce less torque so the B/C concocted gearbox etc could cope better. The boffins at MG didn't think the standard B items were robust enough. Rover SDI V8s (190-odd ftlbs)produce more - its LT77 gbox being design to suit and therefore stronger and more compatible. Both favourites for conversions. You pays your money and takes your pick....
C J Carroll

Been running a banjo axle with a V6 with over 200 ft-lbs. and no problkems, but then I am not a drag racer. If you are a drag racer youi can trash either axle in short order.
Bill Spohn

Is your diff a Banjo or Salisbury
If it's a banjo it ain't going far but a Salisburry should be ok for what you have there
Willy
William Revit

I have a Salisbury on the B GT 1972, It is noisy, and there appears to be quite some play in the system ( ie the clunk on take up and deceleration. ) One of your other threads suggested, thrust washers or bearings? I have yet to fully check the system eg universal joints and like. I Finished the introductory 'hill climb' weekend. it was great, I will take it up, very social, not dangerous. It was not completeed in the Mg, rather the Hyundai Tiburon, I dont think I embarrased myself! There was a chap there with a V8 in his B. it was huge! I think too big. He said the engine moves, and clunks on things like steering masts and firewall. I think that would drive me crazy. Perhaps just a V6? Mike
J.M. Doust

If Perry Stephenson's nitrous 322bhp & 383 ft/lbs doesn't break it then you probably have nothing to worry about.

http://www.britishv8.org/MG/PerryStephenson.htm
PaulH Solihull

This thread was discussed between 22/09/2011 and 27/09/2011

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