4L60e - what rear end gear to go with?
11-29-2009, 10:06 AM
#1
Member
MASTER JOURNEYMAN
Thread Starter
Join Date: Feb 2008
Posts: 47
4L60e - what rear end gear to go with?
I have a 95 impala ss with a 4L60e transmission in it. It has the stock 3.08 gear in it. Wanting to upgrade the gear, but not sure what gear I want to go with. The car will mostly be a weekend cruiser with occasional track time. I had a 350 trans with 373 gear that ran 3000 rpm at 60 mph, didnt like the motor reving that long on long stretches. Any suggestions on a good all around gear, with good take off and good street manners?
11-29-2009, 10:35 AM
#3
Member
MASTER JOURNEYMAN
Thread Starter
Join Date: Feb 2008
Posts: 47
Yea I know that its an overdrive so the rpms would be less with a gear compared to my 350 and 373. I was thinking of 342 or 373 myself, also running the stock 17 inch rims with a 26.5 inch diameter tire.
11-29-2009, 12:14 PM
#4
Member
CRAFTSMAN
Join Date: May 2008
Posts: 51
in theory just adding the overdrive ratio of .70 you should be turning 2100 rpm. Thats without a lock up convertor clutch. if you add lock up i'll drop it about another 200-300 rpm, maybe a little more. alot of the f-body guys go with 3.73's. get down below 1500 your just going to be into the convertor stall so much it'll nuke it.
11-29-2009, 05:15 PM
#7
Member
MASTER JOURNEYMAN
Thread Starter
Join Date: Feb 2008
Posts: 47
Using one of they many rear gear calculators available on the net, at 2850 rpm, with a 26.5 tire diameter, with a 3.42 gear it will cruise at 65 mph. So, ive decided to go with a 3.42 or a 3.55. Any recomendations on what gear would be better? I am planning on a 2800 stall converter and a .525/.525 LT4 hot cam conversion.
