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Discussion Starter · #1 ·
a question for you:

i have a 2000 4.3 auto 3.08(rear) s-10. i assume the rear i a 7.5,
i would like to know if the zexel posi (28 spline) will work for me...how do i know if i have a 26 or 28 spline unit? also what set of gears (size / make) would you recommend (minor mods, daily driver) to go with that posi.
thanks
 

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I am pretty sure that you have a 7 5/8 rearend with a 28 spline, but 7 1/2 (7.5) and 7 5/8 (7.625) are compatable. I would recommend 3.73s, because my friend put 4.10s in his 98 S-10 SS and he pretty much lost overdrive but the 3.73 seemed to have worked great.
 

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Un-Blown Fake ZQ8
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I have a stock 3.42 1 legger and although some think its not enough difference I am considering going to 3.73's. OD w/ 3.42's is a joke. Good for probably 150mph if the truck could do it. I dont think I've been up to 110 yet and probably never will. from 3.42 to 3.73's cant be much more than 1 mpg less mileage, right?
 

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3.42 to 373 is a waste of money. i had 410s in my 98 ss from 342 and i didnt lose overdrive and rpms went up 600 at 65 but top speed in 3rd was 105. on nos i would we close to red line before the end of the track. also on my tranny wont shift into overdrive under full throttle some do but if you go full throttle in overdrive say good by to your tranny.

my buddy just put that posi unit in his truck and it works great

tony
 

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Discussion Starter · #6 ·
gears

ok, so the posi will work for me...but what gears should i use (3.08 now) with it, and what brand should i go with? the mods i have done are mild (k&n, exh), and i'd like to keep mpg in check
let me know what you're experiences are.

thanks
 

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I'd Rather be Blown than Injected
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I have 4:10 gears, At 70mph it only turns 2650 in OD. I mite have lost a mpg or so but i will take the trade off for the performance
any day. Mine will shift into OD at wot. so did my 96SS it had
3:73 gears.
 
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