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I picked up a 87 Blazer 2wd has 350/700r4 308 gears. I would like to out a posi traction unit in it but don't want to spend a lot because down the road I will probably but a better housing in the truck.

I'm told it should have a 7.5 rear end in it. What options is there ?

I came across a used unit out of a newer 90's Camaro with very low use are these the same ?
 

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If it has the 87 rear it is a 7.5" 26 spline. The easiest and cheapest thing is to find a later 7.6 with factory gov-lock or keep looking until you find an 8.5". Don't waste money on the 7.5" 26 spline.
 

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Any 2wd pickup or blazer, 28 spline was 89 up though there will be varying gear ratios. The code should be in the glove box G80 is the gov-lock. I think we have a sticky with gear ratio codes. Get the whole rear end, I believe 98 up are disc.
 

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Actually, I wasn't aware the pickups didn't get them, I've only had first gens until I bought a 2003 crew cab. No problem though the 2wd blazer rear end will bolt in, got one in my first gen.
 

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It should have a tag on the rear with all of the pertinent info. If not...count the teeth and do the math.
 

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Doesn't ford put the number of teeth on the ring gear like most vehicles? Like 41-11 for 3.73?
I suspect the 41? in the pic is part of that. Ford didn't offer a 41-10 (4.10 ratio).
 

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Discussion Starter #18
Well I heard that they did I read that it was the two numbers after the letters and the next two letters. Which would be the 41.
 
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jayyk31
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