Riptide

It's on Mishri and he hasn't done anything about it. I've mentioned a few ideas (rotating 90 degrees, re-torquing things to spec) including taking it to a driveline shop and having them reinstall it and/or testing it on a balancing machine.

FWIW that shaftmasters felt lighter to me than my axle-exchange.

Mudflap

I'm going to guess that rotating the shaft might fix that. I just don't want the OP thinking that Shaftmasters is subpar, I have seen overwhelming good feedback on them.

FastDEW

I have the 4 inch shaftmasters. Would have preferred a 3.5 which they came out with after I purchased mine.

I have had no issues from it. I do get some vibration at 100+MPH, but I am not sure if it is the driveshaft or something else. The vibration is very minimal, so I have never bothered to trace it to a source (plus I am rarely at 100+).

My only negative comment on the shaftmasters is really that I would prefer a shaft without an adapter for the differential. It is not a big deal at all..... Just a comment.

rpietro

Mine is a LFP (Lighting Force Performance), an outfit in Texas, and I've had vibration issues at speeds in excess of 95mph.

Mudflap

Shaftmasters has the direct bolt on now as well.

Lifter583

I am running Dynotech 3.5's on both my GT and GT500...smooth as silk...

rydeordie

What is the pricing of the Dynotech's 3.5 if you don't mind me asking.

Lifter583

Around 750.00 ea... Got them from Brenspeed

Unleashedbeast

I bought a Shaftmasters for my 2008 GT, but never installed it. It's the direct bolt in design that doesn't require an adapter or pinion flange change. The shaft is still new in the box, and since I'm trading my car for a GT500 this weekend, I have to send the shaft back to them. They are swapping it for a GT500 version, which is 1" shorter shaft due to the transmission length difference (T3650 vs. T6060).

They are rated for 750 HP, and that's more than my Shelby will ever make.

JimC

Shaftmasters has been great on my car - I have the 4" and have put a lot of miles on it, with many passes at the track and no problems at all.

The new shafts come all set up for direct bolt in on the GT's so no adapter plates.

I don't think you can find anywhere to beat Shaftmasters on price and customer service.