Gear Change
Posting Guru
Joined: Apr 2000
Posts: 1,345
Likes: 0
From: NorCal
Gear Change
I have a question, I plan to do the follwoing changes on my '90 F150 I6 5Sp 4wd
Ford 8.8 w/ 3.55 --> 4.10 ($200) (possibly LSD $375)
Dana 44 IFS w/ 3.54 --> 4.10 w/ new carrier ($275)
Does anyone have any experience in this? About how long does it take, problems, experiences, ABS problems???
Any Help is appreciated.
Ford 8.8 w/ 3.55 --> 4.10 ($200) (possibly LSD $375)
Dana 44 IFS w/ 3.54 --> 4.10 w/ new carrier ($275)
Does anyone have any experience in this? About how long does it take, problems, experiences, ABS problems???
Any Help is appreciated.
Posting Guru
Joined: Dec 1999
Posts: 1,903
Likes: 2
From: Copley, OH
Gear Change
You're paying a lot of money for that LS diff. Summit sells the Ford Motorsport 31 spline Trac-Lok for the 8.8 (Summit P/N FMS-M4204F318) for $249.95. Also what tires are you running? 4.10 is a lot of gear for a 4.9 with stock tires, not bad at all with big ones though. I'm about to put a set of 3.73s in my '96 4.9 2WD and figure I'll need to upsize tires to 30" or maybe 31" to keep 3rd gear revs acceptable for towing.
Posting Guru
Joined: Apr 2000
Posts: 1,345
Likes: 0
From: NorCal
Gear Change
The LS would be nice, but i'm thinking I'll stick with the open-diff. Right now I'm turning 30x9.50's with my stock 3.55's. Which works fine, but i'm getting a 4" Superlift and going to 33x12.50's.
I was considering 3.73's but the guy at the rear end shop said it would be a waste of time and money to just compensate for the 33's. The 4.10's run the same price as the 3.73's.
I was considering 3.73's but the guy at the rear end shop said it would be a waste of time and money to just compensate for the 33's. The 4.10's run the same price as the 3.73's.
Senior User
Joined: Feb 2000
Posts: 175
Likes: 0
Gear Change
These are the numbers I got with an online RPM Caculator:
@60 MPH 4th/5th
3.08
28's 2218/1774
31's 2003/1602
33's 1882/1505
3.55
28's 2556/2045
31's 2309/1847
33's 2309/1847
What I should have gone with...
3.73
31's 2426/1941
32's 2350/1880
33's 2279/1823
35's 2148/1719
Currently running
4.10
31's 2666/2133
33's 2505/2004
35's 2362/1889
It all depends on the tire that you want to go with. As for the L/S...I went with the Detroit TrueTrac and so far no complaints.
WHaynes
93 F150 4.9
4" ProComp Sus Lift
33x10.5 BFG AT's
4.10's w/Detroit TrueTrac's
@60 MPH 4th/5th
3.08
28's 2218/1774
31's 2003/1602
33's 1882/1505
3.55
28's 2556/2045
31's 2309/1847
33's 2309/1847
What I should have gone with...
3.73
31's 2426/1941
32's 2350/1880
33's 2279/1823
35's 2148/1719
Currently running
4.10
31's 2666/2133
33's 2505/2004
35's 2362/1889
It all depends on the tire that you want to go with. As for the L/S...I went with the Detroit TrueTrac and so far no complaints.
WHaynes
93 F150 4.9
4" ProComp Sus Lift
33x10.5 BFG AT's
4.10's w/Detroit TrueTrac's
Thread Starter
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Senior User
Joined: Dec 1999
Posts: 115
Likes: 0
Gear Change
I had my gears swapped a few months back, 3.08 to 4.56 with 33" tires and E4OD. Total cost was right around $1000 for parts and labor, no LSD. I love it! With the 6cyl and 33's, I'd definately go 4.56 unless you do a lot of highway driving.
WHaynes,
How are the coil springs holding up on you're Pro-comp lift? Mine seem to have settled majorly in just a few months with very minimal driving time.
WHaynes,
How are the coil springs holding up on you're Pro-comp lift? Mine seem to have settled majorly in just a few months with very minimal driving time.
Senior User
Joined: Feb 2000
Posts: 175
Likes: 0
Gear Change
So far so good. I put the lift at the end of last May and unless my rear is sagging along with the front, my truck is still level. I don't do much haulin' but I had my truck on lots of fire roads and it is a daily driver. There doesn't seem to be any degradation of the stiffness either.
