P3 diff.

P3 diff.

Postby moshe » Sat Aug 04, 2018 11:12 pm

Hello friends,I finally finished my 75 & its back on the road!
Now she's screaming for a faster diff.Mine is the original 4.70:1 ratio .should I use a 3.90:1 ratio or dare using a 3.54:1 ratio ?
Usually I drive through flat country .Where can I get one at a reasonable price? I'd love to learn from your experience guys .
Best regards ,
Moshe from Israel .
Posts: 17
Joined: Sun Oct 11, 2009 8:43 pm

Re: P3 diff.

Postby jp928 » Wed Aug 08, 2018 8:40 am

You would have to have a VERY good engine to pull much more than a P4 4.3 diff IMHO. My memory here is not too good, but the nose length may have changed between the 4.7 and 4.3 complete assemblies, so there might be a tailshaft issue, but it should not be a big issue. My preferred solution would be a Laycock overdrive, which will fit on the back of the P3 gearbox - last P4 I had ran a P3 box behind a 90 engine with a P4 overdrive - excellent combination!
jp 26 Rover 9, previously P2, P3, P4, P6,P6B, RR, several Discos.
Posts: 67
Joined: Fri Aug 02, 2013 7:44 am

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