DeadSkunk  (Warren)
DeadSkunk (Warren) PowerDork
6/27/20 6:33 p.m.

Would the gears (front or rear) from a 2013 F150 Ecoboost fit in a 1986 8.8 from a Mustang ? My rearend currently has 2.73 gears and the truck ones might be a good buy for a Challenge build, if they'll work. I don't know the Ecoboost's ratio yet either.

DeadSkunk  (Warren)
DeadSkunk (Warren) PowerDork
6/27/20 7:29 p.m.

Seller got back to me and they're only 3.31 gears, which is a shame because he's selling front and rear gear sets for $25.  $12.50 for a set would have really been a help in a Challenge budget. Oh well, the search continues.

 

Patrick (Forum Supporter)
Patrick (Forum Supporter) GRM+ Memberand MegaDork
6/27/20 8:29 p.m.

Way better than 2.73.  I'd pick up a set just in case you can't find anything else or are up against the budget, providing you can see if they work

DeadSkunk  (Warren)
DeadSkunk (Warren) PowerDork
6/27/20 8:53 p.m.

In reply to Patrick (Forum Supporter) :

True. With the 2.73 gears I'd be going through the traps at 4500 or some such. The 3.31s would add almost 1000 RPM and they would be cheap insurance.

mad_machine (Forum Supporter)
mad_machine (Forum Supporter) GRM+ Memberand MegaDork
6/28/20 12:56 a.m.

that would be traps at peak torque. 

Will
Will UltraDork
6/28/20 10:08 a.m.

Aren't the front gears reverse rotation or something like that?

DeadSkunk  (Warren)
DeadSkunk (Warren) PowerDork
6/28/20 4:03 p.m.
Will said:

Aren't the front gears reverse rotation or something like that?

Yes. The seller sent me pictures of both pinions and they're mirror images.

flatlander937
flatlander937 GRM+ Memberand HalfDork
6/29/20 5:09 a.m.

The 2011+ F150s have a semi floater 9.75 rear diff... Not the 8.8 anymore. Would not work anyway.

DeadSkunk  (Warren)
DeadSkunk (Warren) PowerDork
6/29/20 1:41 p.m.

In reply to flatlander937 :

That I didn't know, so it was a good thing I asked. Thanks

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