Gears for a drag racer?

KarlVP · Apr 18, 2008

I just got a call from a gentleman who wants gears done in his drag truck.

I've done plenty of R&P installs in all flavors of wheeling rigs from big to small without a single complaint or issue.

However, this vehicle will be a drag race vehicle with little to no break in.

Any tips or tricks?

He wants a detroit in a 12 bolt rear end. Not sure the ratio, but he's running about 450HP.

Just worried that I will do an install and it will fail due to no break in time.

JOOP · Apr 18, 2008

1/8th mile or 1/4 mile??

Probably go with 4.56's (1/4 mile) depends on the tire size too. Its a lot like our sport. My Dad ran 1/8th and I believe his were 5.39's???

darius · Apr 18, 2008

KarlVP said:
I just got a call from a gentleman who wants gears done in his drag truck.

I've done plenty of R&P installs in all flavors of wheeling rigs from big to small without a single complaint or issue.

However, this vehicle will be a drag race vehicle with little to no break in.

Any tips or tricks?

He wants a detroit in a 12 bolt rear end. Not sure the ratio, but he's running about 450HP.

Just worried that I will do an install and it will fail due to no break in time.

his gear's with that power will never see the type of abuse a gearset in our world will see, just set them up like you would in any other rig, but I usually try to set up right at the minimum spec on backlash. A drag car's gear's are loaded in staging and for the most part stay loaded through the whole pass. There is no shock loading like in off road.

Binder · Apr 18, 2008

A drag car with a detroit? You need to talk your friend into a spool...

bobbed_84_toy · Apr 19, 2008

Binder said:
A drag car with a detroit? You need to talk your friend into a spool...

x2!!

sixty-nine · Apr 19, 2008

try this site [SIZE=+1]Optimum Rearend Ratio Calculator[/SIZE]

Totalled · Apr 19, 2008

Trans brake, foot brake, or man trans? He'll probably want a set of "racing" gears that are a little softer and take the shock load of a launch better.

If he's using a trans brake, as stated above, the gears will pretty much be loaded and won't get the shock load a manual trans car would have.

Detroit? Is it a street/strip car then? if it's only a drag car, then spool it.