rear gears

[gomer]

i have a \'99 s-10 and am in the process of putting a lt1 in it. what is the rear end bolt size? like 10 bolt or what? would changing the gears be good enough?

[basementdweller]

10 bolt, check to see what gears you have first, I believe you can find out by using the ##\'s found in the glove box. (If they still put them in there.) Or you can use chalk and a jack http://www.s10v8.com/images/smilies/icon_razz.gif

[fasrnur]

In the glove box you should find a sticker that has a bunch of option codes. They will be as follows if you find the sticker



GU4 3.08 ratio

GU5 3.23 ratio

GU6 3.42 ratio

GT4 3.73 ratio

GT5 4.10 ratio



If you can not find the sticker you can call your local dealer and give them the last 8 digits of you V.I.N. and they can tell you what ratio you have.



Hope that helps you.



Jeff....

[gomer]

ok, so if i find the list, then what? which one is the one i have? plus what is the diameter for the 10-bolt for buying new gears? thanks for all you help.....

[gomer]

scratch that last post. that made complete since to me now. i have the 3.73. will that be good enough for the lt1 or should i upgrade to a 4.10 or something. let me know........

[fasrnur]

The 3.73 would be good for stree use if you have an overdrive tranny. If not you\'ll buzz

the motor at about 33-3400 at like 55-60 mph

The 4.10 would be a neck snapper and you would have to have traction bars and/or darn good tires to take advantage of the launches.

You for sure have to have an o/d tranny if you wanted to drive it at all on the highway.



Have fun and good luck.



Jeff.....