RichP Posted April 18, 2009 Posted April 18, 2009 I'm after changing my current 3.62 diff for a 3.92 or 4.10. I believe it's a 7" as it's 7 inches across the top mounting points as seen below, but am prepared to be corrected. My current diff has the viscous LSD and would like another with this fitted if possible. As ever, hoping not to spend a fortune and to be honest I'm not sure what these cost, but interested in whatever people have rather than having the current one re-built. Cheers Rich
JH200 Posted April 21, 2009 Posted April 21, 2009 Hi Rich, I have a 4.1 diff in a case with the ford lsd in for sale. please give me a call. thanks John: 07811115791
RichP Posted May 7, 2009 Author Posted May 7, 2009 BTTT John's diff is 7½", I need a 7" 4.1 ratio preferred if possible - W-H-Y?
RichP Posted May 28, 2009 Author Posted May 28, 2009 Bump - any 7" 4.1 visous LSD's out there? (or ATB it not too pricey!)
Johnson Posted May 28, 2009 Posted May 28, 2009 Raceline sell them new here make sure you are sitting down
RichP Posted May 28, 2009 Author Posted May 28, 2009 Flippin 'ek....... Good but used one anywhere!!??
thos Posted May 28, 2009 Posted May 28, 2009 7" 4.1 is after-market only, so pretty rare, Kam Diffs make them but they're pricey. 4.44 and 4.7 along the same lines, rarer the lower you go. Second hand? Good luck. You can get a 4.07:1 in a 7.5" from a Scorpio 2.0 8v, and a 4.27 in the 16v. Straightforward swap from 7" to 7.5", but weigh in a good bit heavier.
RichP Posted May 29, 2009 Author Posted May 29, 2009 Thanks for the tips Thos. I did find a 7½" 4.1 but I can't get it in my car - it's an earlier chassis and there are no spacers around the 7" diff to remove to make space (see pic at the top). To get a 7½ in there I'd have to modify the chassis which I'm not inclined to do (unless there's another cunning method that I'm not aware of - grind lumps off the 7½" diff?).
thos Posted May 29, 2009 Posted May 29, 2009 3.9 could be the only option. Otherwise it's the £5-600!
John Loudon - Sponsorship Liaison Posted June 22, 2009 Posted June 22, 2009 If there are no spacers to remove, cut a bit off the diff casing
Bananaman Posted June 23, 2009 Posted June 23, 2009 If there are no spacers to remove, cut a bit off the diff casing What about drive shafts?
RichP Posted June 23, 2009 Author Posted June 23, 2009 John. I did wonder if it was possible to trim a quarter of an inch off each diff mounting flange on a 7½ inch diff to fit it into the 7 inch space. However as Banaman mentions I don't know if my driveshafts will still fit. I'm also a bit nervous about hacking lumps of an expensive item - and reducing the mounting strength in the process. That said, I'm only running a x-flow at the moment so it's not exactly stressed! I also understand that a 7½" diff is very heavy in comparison to a 7"?
thos Posted June 23, 2009 Posted June 23, 2009 Driveshafts are the same for 7.5 vs 7 inch. But the 1/2inch mounting different is all on one side, so if you take a 1/4 of each side, you'll have offset the diff by 1/4" and will need different driveshafts. Standard 7.5inch has threaded mounts, as opposed to 7" straight through bar. Cant think off the top of my head if there is enough meat to take off 1/2" .. I doubt it, but someone with one lying around might be able to tell you. 7.5 inch is heavier ....try a search?
RichP Posted June 23, 2009 Author Posted June 23, 2009 Thanks Tom - I can see all this ending in a big bill to rebuild the one I've got with the ratio I want! The question then changes - is £500 on a diff a better performance investment than £500 on the engine? I think it may be as I won't get much more grunt for £500 out of the x-flow.
Recommended Posts