S3 with a Rover V8-trans question - Defender Source
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  #1  
Old April 7th, 2016, 07:26 AM
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S3 with a Rover V8-trans question

Customer brought in a S3 2wd 88" fitted with a Rover V8. It was mated to the Series transmission/transfer case that is having bad noise issues.
I don't know if the engine power caused the transmission issues or the fact that the PTO cover with the output shaft support built into it was assembled backwards- yes, it was sticking out of the case- contributed to it's demise. Really, have no idea what else is wrong internally.
So, fit another Series box, a 5 speed, or an early 110 4 speed?
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  #2  
Old April 7th, 2016, 06:15 PM
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My thoughts - I think any Series gearbox is living on borrowed time behind a V8.

What gearing does it have? With stock everything it would be nearly undriveable with a V8. With 3.54 gears or an Ashcroft T-case, you could get away with a 4 speed, but with stock gears a 5 speed would probably make a world of difference...

Edit - I meant a non-series 4 speed... LT95 or something like an NP435.
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  #3  
Old April 7th, 2016, 06:24 PM
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The gearbox is not up to the power. The transfer case is okay for it though.
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  #4  
Old April 8th, 2016, 02:20 AM
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LT77 four cylinder or stubby R380 with the Ashcroft adaptors to the V8 (should work with what is on there now) and to series T-Case is really the way forward if the customer wants to keep the V8. A four cylinder LT77 take out from an import should be somewhat reasonable. Any other option (LT95 out of a forward control 101 would be my second recommendation) is going to require a lot of modifications. The best route forward is probably to ditch the V8 entirely.

http://www.ashcroft-transmissions.co...peed-kits.html

Whether this works depends on large part where the V8 is currently fitted.

The late SIII "Santana" series transmission might handle the power and is the lowest hassle option. If it is not driven a lot or hard you could just replace/rebuild as is, but a series box and a V8 is not ideal.
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  #5  
Old April 8th, 2016, 07:27 AM
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Unless the pockets are deep put a SIII box back in and tell the guy to drive it easy.

Having done many Rover V8s in Series over the years the other options, although stronger and better overall, are much more costly.

The 5 speed box to Series transfer works great, but it isn't a bolt in and you will have lots of custom work to do.
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  #6  
Old April 8th, 2016, 07:38 AM
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what Mike said .. I had a 109 pickup that was my daily driver for years with a chevy 292 that easily put out more HP than the rover V8.. ran with an SIII box without issue.
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Old April 8th, 2016, 07:58 AM
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My spidey sense tells me it's not going to be abused, and the lack of 4wd also suggests not much more than commuting. Every Series I've had in with non-standard engines- a 109 with a 4bt and another with a sbc required ridiculous hours to make non standard transmissions work well.
So, who has ready to go Series transmissions?
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Old April 8th, 2016, 08:52 AM
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What's the old saying... Good, fast and cheap. Pick two...
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  #9  
Old April 8th, 2016, 10:44 AM
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Truer words were....
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  #10  
Old April 13th, 2016, 06:59 AM
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I ran a 200tdi mated to the s3 gearbox on the Series 1. Same rules as Mike states, slow and steady and all works well. If you drive it like an Iroc, you will soon be replacing your gearbox. If you drive it like a series but with extra guts only when needed, perfection.
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  #11  
Old July 30th, 2016, 12:49 AM
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I have been driving an SIII 88 hard with a series transmission behind a 3.5 for 10 years. Aside from munching some synchros, it has held up fine, several years with and Edelbrock carb and at least the last seven with a 3.9 top end and Lucas Hotwire efi. I am not particularly soft on it. Use the composite gasket and run it on 87 Octane :-)
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