gearing questions
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Freshman User
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gearing questions
I just recently bought a 1990 f150 xlt lariat, 302 4x4. I'm trying to figure out the gearing of the rear end, and how many spline it is. I checked the tag on the rear and the top set of numbers is S815D. I got that this is a 8.8 rear, but i was wondering what the gear ratio is. If anyone could help me that would be great! thanks!
tage reads: S815D
4L10880E09
tage reads: S815D
4L10880E09
Last edited by bsecrease; Jan 22, 2007 at 04:53 PM.
Post Fiend
Joined: Mar 2002
Posts: 19,402
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From: Bonita Springs FL
That is a rare bird indeed. You don't see very many 4.10's with limited slips from the factory - in fact, I don't think I've ever seen one. If it were me, I'd verify that the front axle has the same or similar ratio. There will a tag hanging off the front as well.
You can tell it has 4.10's because of the first few digits in the second line of the tag: 4L10
The "L" in the middle means limited slip. The numbers are obviously the ratio.
You can tell it has 4.10's because of the first few digits in the second line of the tag: 4L10
The "L" in the middle means limited slip. The numbers are obviously the ratio.
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ok, I checked the tag on the front diff, and it says 4.09 on the top line. Would that be a match? Do you know what spline the rear and front would be?
Last edited by bsecrease; Jan 22, 2007 at 11:03 PM.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Originally Posted by Fal Grunt
neener neener I have a 4.10 LS 
course the clutch packs are shot... so what good does it do me right? -myers
course the clutch packs are shot... so what good does it do me right? -myers
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i ain't rite
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From: Marlboro Mental Hospital.
Originally Posted by bsecrease
ok, I checked the tag on the front diff, and it says 4.09 on the top line. Would that be a match? Do you know what spline the rear and front would be?
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