axle upgrade

[93lx50conv]

Hey i when i'm ready to put 3.73's in my 8.8, i also am looking into a heavier duty axle upgrade. If i go with a 31 spline axle, is there any other things i have to consider with the rear with this axle? Then I'm putting an aluminum driveshaft, and a whole suspension kit, i think eibach pro kit with kyb gas-adjust shocks. Thanks.

 

[Jkstang78]

Hey i when i'm ready to put 3.73's in my 8.8, i also am looking into a heavier duty axle upgrade. If i go with a 31 spline axle, is there any other things i have to consider with the rear with this axle? Then I'm putting an aluminum driveshaft, and a whole suspension kit, i think eibach pro kit with kyb gas-adjust shocks. Thanks.

You will have to change the limetd slip unit or posi. they are set for 28 spline axles. I would also change all the axle bearings while your in there

 

[93lx50conv]

Yea thats what i thought, so you think I should just stick with heavy duty 28 spline axles? thanks

 

[Jkstang78]

Depends on what your doing. If it is for drag racing 31 or more all the way. I have 31 in my car and I am leaving at 6K everypass. It just a saftey issue. But if you are going to just drive it and do some street racing then you can stay with the 28s

 

[93lx50conv]

Alright, Right now im just starting with upgrading drivetrain, then im moving to motor, I'm not going to have a drag car, It's going to be street with some occasional passes at strip. But If i were to get 31 spline, how much is the posi unit for 31 spline? thanks

 

[Schlodes]

Hey i when i'm ready to put 3.73's in my 8.8, i also am looking into a heavier duty axle upgrade. If i go with a 31 spline axle, is there any other things i have to consider with the rear with this axle? Then I'm putting an aluminum driveshaft, and a whole suspension kit, i think eibach pro kit with kyb gas-adjust shocks. Thanks.

I have a question about posi units...

I've heard and read that the eaton ones are good. My buddy had a Detroit locker unit in his 87 T Type that worked well.. I did have a buddy with a Canyon Red 86 RS Capri [now competes in Renegade] that had an Auburn unit back in 1995/1996. I remember he was running mid/low 11s [best was 11.19 I think] and it started getting 1 wheel peelish on his burnouts half way thru the day, and his 60 foots were all over that day from 1.50s to 1.90s.. Doubt i'd buy one.

Anyone ever used/using a powertrax unit? I want to change the stock trac lok unit and probably axles too - but whens a good time to upgrade 31 spline axles?? Low 12s? 11s? or is it, when you start routinely cutting 1.6xx 60s on slicks?? Wonder if there is a way to put a stiffer spring in the stock trac lok unit so it gets two tires no matter What all units do you guys prefer/are using?

Because I HAVE seen a bone stock rear w/ 3.73s run 10.77 @ 131 MPH 1.68 60' before in my friend Franks 89 LX hatch [VERY Built/girdled 306, T5-Z, 3.73s, w/ S trim & aftercooler @ 14 PSI]. The above mentioned Capri had stock axles and what not too... just 3.5 gear, and the Auburn posi unit when doing the low 11s. Neither of them broke..

But I DO want to upgrade my posi unit anf figured while it was apart i'd buy some better axles... Just wanted your opinions as tons of you have been there & done that

Thanks!

 

[Jkstang78]

Alright, Right now im just starting with upgrading drivetrain, then im moving to motor, I'm not going to have a drag car, It's going to be street with some occasional passes at strip. But If i were to get 31 spline, how much is the posi unit for 31 spline? thanks

If I rember right it is about $300-400 for a new limted slip