GM 7.5 with moser axles

[Twister79]

well guys i bought an 7.5 with moser 28 spline axles with a gm 3:73 gear for $200 and what i want to know is can it stand behind a mild bbc 468 with a 4:56 gear swap and M/T et streets p295/50/15

but was the buy worth the money and time???

 

[Doober]

Well you paid less for it than you would the pair of axles. If it really is a mild BBC I would try it with the 3.73s, I personally don't think you'd need a set of 4.56s... plus with that much more torque (4.56 compared to 3.73) I think you may be asking for more trouble than you are with the 3.73s. It might be ok, but if you're racing it with sticky tires and a BBC to boot I would seriously look at upgrading, especially if you plan on racing it regularly.

 

[LS6 Tommy]

If the only thing that's been upgraded is the axles, it's a goner....

Tommy

 

[Doober]

Yeah, I'd say a support cover at the minimum... I'm not sure what else can be upgraded strength-wise on them besides welding the tubes. I'm sure you would break something in the center section before you have to worry about twisting a tube though.

 

[cutlass389]

If you're CERTAIN that it has 28 spline Moser axles then I'd put a support cover on it with the 3.73's and run it IF you're footbraking with an automatic and the BBC is mild. Clutch, transbrake, huge stall, or making more steam than you're letting on are all deal breakers.

 

[lurchsmalibu]

If you're CERTAIN that it has 28 spline Moser axles then I'd put a support cover on it with the 3.73's and run it IF you're footbraking with an automatic and the BBC is mild. Clutch, transbrake, huge stall, or making more steam than you're letting on are all deal breakers.

NOBODY underestimates their "steam".... :lol:

Expect breakage sooner or later.

 

[cutlass389]

NOBODY underestimates their "steam"....

Oh yeah, I'm makin' 700 horsepower at 9:1. :^o :roll: [-X

 

[lurchsmalibu]

NOBODY underestimates their "steam"....

Oh yeah, I'm makin' 700 horsepower at 9:1. :^o :roll: [-X

:lol: O

 

[Mikethemasher]

I ran a 7.5 with 3.73's and minispool for 10 years. It finally exploded this year on a run with a 1.67 60ft. The ring and pinion exploded going into 2nd gear. A 7.5 will last a long time running high 12's to low 13's but deflection becomes a big issue from mid 12's and faster. Whatever you decide make shure you run c clip eliminators. I'm in the process of doing a 8.8 swap on my Olds powered Olds.

 

[cutlass389]

Which is precisely why a support cover is mandatory on any 7.5".