Need help w/ 4X4
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New User
Joined: Dec 2004
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Need help w/ 4X4
Hey guys I'm new here and recently bought a '90 ext. cab 4X4 w/ 351 and e4OD.It has 5" lift w/ 35X12.5-15 BFG all-terrain T/A's.
The truck needs a gear bad and need some help with confirming front and rear diff. Is it a Dana 44 in the front and a 8.8 inthe rear?
The truck is EFI and I'm wondering what computer is in the truck.
I'm a Mustang guy and understand performance upgrades in the EFI area but need to know where to start.
I would like to convert to Mass Air and install a cam,heads,intake and exhaust.
If anyone could help it would be greatly appreciated.
The truck needs a gear bad and need some help with confirming front and rear diff. Is it a Dana 44 in the front and a 8.8 inthe rear?
The truck is EFI and I'm wondering what computer is in the truck.
I'm a Mustang guy and understand performance upgrades in the EFI area but need to know where to start.
I would like to convert to Mass Air and install a cam,heads,intake and exhaust.
If anyone could help it would be greatly appreciated.
Postmaster
Joined: Dec 2002
Posts: 3,959
Likes: 9
From: USA
If this is an F150, the axles are 8.8" rear and Dana 44 TTB front. If it's an F250, the front is either a Dana 44HD TTB or a Dana 50 TTB and a Ford 10.25" rear. The front gears are reverse cut.
With 35" tires, a 351 and overdrive, your axle ratio decision should be between 4.56's and 4.88's, depending on how you use the truck. If you're towing with it, 4.88's will be better, otherwise, 4.56's will be fine.
I run 4.56's with 33's on my F350 with a 351 and a C6. I use it for hauling a slide-in camper and pulling a trailer and the low ratio really helps since the 351 isn't all that powerful and the truck is heavy. If I had an ovedrive gear in the trans, the truck would have the perfect balance between towing power and highway gear, for me anyways.
With 35" tires, a 351 and overdrive, your axle ratio decision should be between 4.56's and 4.88's, depending on how you use the truck. If you're towing with it, 4.88's will be better, otherwise, 4.56's will be fine.
I run 4.56's with 33's on my F350 with a 351 and a C6. I use it for hauling a slide-in camper and pulling a trailer and the low ratio really helps since the 351 isn't all that powerful and the truck is heavy. If I had an ovedrive gear in the trans, the truck would have the perfect balance between towing power and highway gear, for me anyways.
