thoughts on diffy change

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azruss
Posts: 3599
Joined: Sun May 30, 2010 12:24 pm
Your car is a: 80 Fiat 2000 FI

thoughts on diffy change

Postby azruss » Thu May 18, 2017 3:55 am

Just changed my diffy from a 4.3 to 3.9 in my 2Lfi. Also added a limited slip. The ratio change made the gear selection more realistic, meaning I'm now a gear down at speeds under 50 mph, making the gear ranges more "normal". I don't notice any difference in acceleration (i'm sure there is some if I put a watch to it). Has plenty of passing power above 50. Ran it up to 5k rpm (90mph?) and it was still pulling strong when I got off the gas ( I was in a 50 mph zone). So, I'm happy with the change.
Haven't had a chance to mess much with the LSD, but first impressions are it wants to kick the rear end out faster than before.

Funcar
Posts: 175
Joined: Mon Nov 11, 2013 7:24 am
Your car is a: 1972 Fiat Spider 124
Location: Kitchener Ontario Canada

Re: thoughts on diffy change

Postby Funcar » Thu May 18, 2017 5:41 am

Congratulation on the diffy change. I am happy for you that it went well and the outcome successful. This is not a job for the faint of heart. Careful with the speeding. :lol:

ORFORD2004
Posts: 745
Joined: Wed Mar 17, 2010 9:48 pm
Your car is a: 1983 PININFARINA
Location: Sherbrooke, Qc, Canada

Re: thoughts on diffy change

Postby ORFORD2004 » Thu May 18, 2017 10:47 am

You put a pre 1979 diff in your car?

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azruss
Posts: 3599
Joined: Sun May 30, 2010 12:24 pm
Your car is a: 80 Fiat 2000 FI

Re: thoughts on diffy change

Postby azruss » Fri May 19, 2017 1:31 am

yes. the car has a tranny and diffy out of a 71. I do have a good 80 diffy and an 80 tranny that pops out of gear.


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