Page 1 of 1
3.9 Diff
Posted: Mon May 18, 2009 9:45 pm
by d_harris
Having purchased a 3.9 Crownwheel and Pinion from someone on here not so long ago I thought it was time to give it a go....
Unfortunatly didn't do a howto but it was pretty straighforward to swap them over but with luck more than judgement its dead quiet until you hit ~65 when it sings a little, but to say that I am chuffed is a proper understatement!
Posted: Mon May 18, 2009 9:57 pm
by bmcecosse
Have you figured out what tpm speedo you need - to get accurate speed/mileage readings ?
Posted: Mon May 18, 2009 10:07 pm
by d_harris
I've got a 1376 (I think) which is the speedo for a 4.55 in at the moment which reads about 10% quick. I reckon a 1408 would be nearly bang on....
(remember I have the 13" wheels....)
Posted: Mon May 18, 2009 10:25 pm
by bmcecosse
1408 certainly common enough - not come across a 1376 before - what car is it from ??
Posted: Mon May 18, 2009 10:26 pm
by d_harris
Well, I have 2 in the car at the moment. One is a mini one. The other from a crossover 1098... (i.e 1098 engine 4.55 diff)
Posted: Mon May 18, 2009 10:34 pm
by bmcecosse
Ahh - thought 4.55 diff would be 1508 speedo - that's what came out of mine - and it was very accurate - with 14" wheels/155 tyres.
Posted: Tue May 19, 2009 12:52 am
by mike.perry
A 1408 is accurate with my 3.9 diff and 175x13 tyres.