Differentials ?'SSS
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Senior User
Joined: Jun 2006
Posts: 309
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From: Toasty FLORIDA
Differentials ?'SSS
Ok so my 1988 F-250 has a 3.55 open dif. Right now my entire set up includes, 33" tires, 302 engine, 5 speed manual tranny. what would be a good all around dif for my truck, and how much would it cost to drop a posi or Limited Slip, instead of my open dif!
FTE Legend
Joined: Aug 2004
Posts: 37,887
Likes: 20
From: North Central Rural Sask.
I think with your truck, the weight, engine size, and the tire size, it would be a good idea to go with at least 4.10 gearing.
Posi trac is a chevy rear end
Limited slip should be a fairly easy swap in. I myself would go check a few of the local junkyards and see what you can find. Take a piece of paper with the axle codes written on them and I bet you will come up with something.
Posi trac is a chevy rear end
Limited slip should be a fairly easy swap in. I myself would go check a few of the local junkyards and see what you can find. Take a piece of paper with the axle codes written on them and I bet you will come up with something.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
<i>now my question is as fallow's will I have to replace the front diff as well since I am going to be changing the gear ration on the rear?</i>
Yes, the ratio front and rear must be the same.
Yes, the ratio front and rear must be the same.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Same way you identified the 3.55 ratio in your truck.. with the door pillar axle code.
