Brewster Posted October 22, 2020 Share Posted October 22, 2020 Selling my 7.5" limited slip diff now I have swapped it for one with a Quaife. This is what the factory fitted to my car when it was built by them in 2014. It's listed on the build sheet as an option the original purchaser specified and it has done 2000 miles. I swapped it as I prefer the driving characteristics of a Quaife having become used to the one I fitted to my other car. I called the factory to ask which manufacturer of diff they installed but they couldn't say. It definitely works though. It does have a weep from the nearside driveshaft output, but is otherwise sealed well. I'm unsure whether a new seal could be installed without opening the case, but I understand the flanges can just be pulled from the case so this may possible. It was a direct swap with the 7". No differences in any of the flange sizes or PCDs. Just the wider casting at the top which required a packer and a threaded bar from the factory to fit the 7". I will include the bolts that I didn't reuse for the top mount so should be a direct swap for anyone who wants an LSD. £500 collected from either North Lincs or Richmond in London. Link to comment Share on other sites More sharing options...
Ian Kinder (Bagpuss) - Joint Peak District AO Posted October 22, 2020 Share Posted October 22, 2020 I'd suggest you add the diff ratio to your post. Are you sure it's plated and not a viscous? Link to comment Share on other sites More sharing options...
Tim Reid Posted October 22, 2020 Share Posted October 22, 2020 43 minutes ago, Brewster said: It was a direct swap with the 7". No differences in any of the flange sizes or PCDs. Just the wider casting at the top which required a packer and a threaded bar from the factory to fit the 7". Just to be clear... this will fit a chassis made for a 7.5" and you fitted a 7" using packers. But would I be correct in saying this 7.5" won't fit a chassis made for a 7"? Link to comment Share on other sites More sharing options...
Kingster Posted October 22, 2020 Share Posted October 22, 2020 1 minute ago, Tim (TimDave25) - Joint Thames Valley AO said: Just to be clear... this will fit a chassis made for a 7.5" and you fitted a 7" using packers. But would I be correct in saying this 7.5" won't fit a chassis made for a 7"? All SEIW chassis need a spacer for a 7” AFAIK. So a 7.5” will fit all (recent-ish) cars - again AFAIK. Link to comment Share on other sites More sharing options...
Tim Reid Posted October 22, 2020 Share Posted October 22, 2020 10 minutes ago, Chris King - Webmaster said: All SEIW chassis need a spacer for a 7” AFAIK. Mine might be an exception as it's an 1996 SEIW without a spacer. Back then 7" diffs were easier to come by and I think Westfield changed the chassis a number of years later to fit the 7.5". Link to comment Share on other sites More sharing options...
Kingster Posted October 22, 2020 Share Posted October 22, 2020 1 minute ago, Tim (TimDave25) - Joint Thames Valley AO said: 1996 SEIW Well I guess that’s nearly 25 years ago - so must be a “new” innovation 😁 1 Link to comment Share on other sites More sharing options...
Brewster Posted October 23, 2020 Author Share Posted October 23, 2020 12 hours ago, Ian Kinder (Bagpuss) - Joint Peak District AO said: I'd suggest you add the diff ratio to your post. Are you sure it's plated and not a viscous? No idea on the ratio or what's inside other than it acts like a plated diff, locking on acceleration and deceleration and it's what the factory specced and supplied when they built the car. I called the factory to ask what they use and got told "Whatever we could get at the time." 11 hours ago, Tim (TimDave25) - Joint Thames Valley AO said: Just to be clear... this will fit a chassis made for a 7.5" and you fitted a 7" using packers. But would I be correct in saying this 7.5" won't fit a chassis made for a 7"? Correct. I fitted my new 7" with a packer. This will fit any car that currently has a 7" fitted with a packer/spacer on the nearside top mount. If your car has a 7" diff with no spacer then it won't fit. Link to comment Share on other sites More sharing options...
Dave Eastwood (Gadgetman) - Club Chairman Posted October 23, 2020 Share Posted October 23, 2020 The diff ratio can be calculated, you just need to work out how many times the output shafts turn for every turn of the input. 1 Link to comment Share on other sites More sharing options...
TAFKARM Posted October 23, 2020 Share Posted October 23, 2020 Bargain! Plate LSDs are for winners! Link to comment Share on other sites More sharing options...
John Loudon - Sponsorship Liaison Posted October 23, 2020 Share Posted October 23, 2020 I am itching to get a stanley blade and slice that excess sealant off 1 2 Link to comment Share on other sites More sharing options...
Crash test dummy Posted October 24, 2020 Share Posted October 24, 2020 18 hours ago, John said: I am itching to get a stanley blade and slice that excess sealant off Even better - a thumbnail. Very satisfying. Just me? Link to comment Share on other sites More sharing options...
Brewster Posted October 27, 2020 Author Share Posted October 27, 2020 So far we've discerned that it's a limited slip diff. It could be plated, but might be viscous. It works on both acceleration and deceleration. It has a weep from the nearside output. It is 7.5" and will fit most post 96 Westfields. Surely someone wants it for £400? If not I'll get it rebuilt, find out exactly what it is in the process and put it up for twice as much. 1 Link to comment Share on other sites More sharing options...
Steve (sdh2903) Posted October 28, 2020 Share Posted October 28, 2020 For the price of some rtv and a litre of oil I'd whip the cover off and have a peek what's inside. Might get you a better price and easier sell if people know what their getting. 1 Link to comment Share on other sites More sharing options...
Tim Reid Posted October 29, 2020 Share Posted October 29, 2020 I second that.. also... 1. If you post it you have to drain the oil anyway. 2. Anyone who buys a second hand diff should put new oil in just to be sure. 1 Link to comment Share on other sites More sharing options...
Dave Eastwood (Gadgetman) - Club Chairman Posted October 29, 2020 Share Posted October 29, 2020 Whoever buys it is going to have to know what type of plate diff it is, as unlike sealed Viscous diffs and Quaife ATB's, plate diffs do need special LSD oils. 1 Link to comment Share on other sites More sharing options...
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