38" tires?
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New User
Joined: Apr 2008
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38" tires?
i have a 91 f150 4x4 with a 351. i want to go up to 38" mudd tires and i am concerned about what gears or rear end replacement i should use. should i go 8 or 10" up and what about my transmission? i know i'm gonna have to make alot of changes i just don't know what changes i should make?
Posting Guru
Joined: Dec 2006
Posts: 1,118
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i think 8 inches would clear them but im not sure about on a 150, might need a 10
your gonna need to regear probably to 4.88s maybe 4.56s
i believe you have the AOD trans with the new gears and regular maintnance it should be fine but again im not very familiar with the AOD
your gonna need to regear probably to 4.88s maybe 4.56s
i believe you have the AOD trans with the new gears and regular maintnance it should be fine but again im not very familiar with the AOD
Elder User
Joined: Oct 2006
Posts: 840
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From: Poquoson Va.
If you plan on 4 wheeling hard with 38s, your 1/2 ton stock axles will be the weak link. If its mostly street and mild wheelin you may get by. 4.88 gears will be about right for 38s. 38s is alot of tire for TTB front end. Im not saying you cant do it, just be prepared to change a few parts in the front end when wheeled hard. I broke a few axles running 35s. Replaced with junkyard parts and kept on going. Good Luck.
Post Fiend
Joined: Apr 2004
Posts: 6,473
Likes: 4
From: Lafayette, IN
While it would fit, and could be done, the AOD was not put behind the 351 in these trucks. C6, then E4OD later on. Either tranny is fine. If you have OD, it's the E4OD, if not, it's the C6.
Jason
Jason
Senior User
Joined: Mar 2008
Posts: 400
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the 8" lift should clear the 38s but might be a bit tight
4:88 would be a good gear choice
but keep your eyes open for some bigger axles, or put them in before ya gear it----so ya dont buy gears twice
id be real concerned with 38s on the stock axles, especially the ttb
4:88 would be a good gear choice
but keep your eyes open for some bigger axles, or put them in before ya gear it----so ya dont buy gears twice
id be real concerned with 38s on the stock axles, especially the ttb
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
this is a hard question becasue you didnt specify the type of use this vehicle will see. but if i was you this would be the route i would take.
do an SAS up front with a Dana 60 and run 5.13 gears.
rear would be a D60 or 14bolt either is up to you running 5.13's as well.
install the largest tranny cooler you can find along with a remote tranny filter and tranny temp gauge.this is how you keep the auto happy and alive.
the sas will gain you the needed lift height for sure. check out fullsizebronco.com for a huge forum specific to SAS installs.
since you have an OD tranny the gears i mentioned will be just right. i currently run 4.88's with 35's.
do an SAS up front with a Dana 60 and run 5.13 gears.
rear would be a D60 or 14bolt either is up to you running 5.13's as well.
install the largest tranny cooler you can find along with a remote tranny filter and tranny temp gauge.this is how you keep the auto happy and alive.
the sas will gain you the needed lift height for sure. check out fullsizebronco.com for a huge forum specific to SAS installs.
since you have an OD tranny the gears i mentioned will be just right. i currently run 4.88's with 35's.
Cross-Country
Joined: Nov 2007
Posts: 59
Likes: 1
If your just worried about tires clearing go 6" lift with a 3 inch body. Your drivetrain will thank you and you won't believe how much easier that two inch difference makes on cost and hours configuring angles.
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New User
Joined: Apr 2008
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thanks everyone for the info. i was more concerned with the tranny, gears, and stuff like that. i already have the lift picked out.
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