4speed Vs. 3500

[The Dark Side of Will]

The TH125 axles have smaller diameter shafts and CV joints than the manual transmission axles.

Both manual transmission axles use mail splines at the transmission end. I believe the TH125 axle uses female splines on the driver's side.

[Emc209i]

I believe the TH125 axle uses female splines on the driver's side.

Yep.

[Shaun41178(2)]

Learn something everyday.

[ericjon262]

so in other words, I need to source a driver side axle still.

[Emc209i]

Unless you plan to use a newer series automatic transmission... yes.

[ericjon262]

Whats the best source for an axle? any other cars use the same axles? are there any cheap upgrades I can do?

Thanks-

Eric J.

[Atilla the Fun]

Keep checking the Old Europe Mall, I just saw some M/T axles on there yesterday. To use the 4-speed manual, just get the axles from any M/T Fiero.

[ericjon262]

I'm going to get a reconditioned set from rock auto. any downside to this?

[The Dark Side of Will]

Aftermarket shafts are made of modeling clay, or maybe at best a high grade of solder. If you're running significant horsepower and launching the car hard, you'll need factory shafts.

Matt Hawkins went through several sets of reman axles before he tossed a set of junkyard factory axles into his car and stopped having problems.

[ericjon262]

do you think I'd have problems with a stock 3500 breaking them? that's the most I'd be throwing at them for a long while.

[Emc209i]

Probably not. Still, you might as well take a 30mm axle nut to the yard and find a set of used axles.

[ericjon262]

fieros are non existent in the yards in northwest florida, any other cars have the same axles?

[Emc209i]

No, I'm not aware of any other vehicle. If you cant find them down there, source them from anyone online. I have a couple of extra pair, but I'm keeping them because I'm probably going to need a few backup sets.

[ericjon262]

well, if any of you have a set, PM me a price! otherwise, old europe it is.

[Emc209i]

I broke down and sent you a PM.