Drag Racing Discussions > Front Engine Dragsters

Pinion height.

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retroboy:
Howdy.
I’m just about finished my build and it will be the first time I’ve been down a track in 25 or more years but I’m already thinking about building my next car.  Next time I would like to use a diff with a higher pinion than a 9” so I can run the engine nose down a little rather than the current set up that is level.  Any suggestions for a diff that has a higher pinion height ?
Cheers

rooman:
Of the ones that are practical the 8 3/4 Mopar and the 12 bolt conversion for the 9" housing are probably the best bets.

Roo

hemidakota:
Anyone ever use a dana 60? or is it just an expense thing?

dusterdave173:
Just to add a note on Mopars I have done them for many years
There are three carrier casting numbers--Folks always say use the "489" case as it has thickest pinion shaft diameter--well.big deal--it is tapered, used a crush sleeve to set preload and so it is a PIA or you use a machined spacer to take place of the crush sleeve but..
Best bet is the "742" housing --Plenty big pinion , easy shims to set up, lots of gear selection
Easiest to set up and plenty strong
The "741" housing is the one to avoid--poor gear selection, small pinion diameter
8 3/4's are a very tough!

dreracecar:

--- Quote from: hemidakota on January 14, 2015, 05:01:59 PM ---Anyone ever use a dana 60? or is it just an expense thing?

--- End quote ---
Have to pull the entire RE to do gear change and also heavy

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