Transmission swap
Mountain Pass
Joined: May 2020
Posts: 151
Likes: 10
As long as you have the bell housing from the 86 manual it will bolt right up onto your 90. The other thing you need to look out for is that you'll need to get a clutch kit and flywheel for a 86 and put it on your 90. They will bolt right onto the block just fine. But the clutch/flywheel that fits a 1990 will be too big for the input shaft off a 1986 4-speed.
I've done the opposite of what you're doing, I put a transmission from a 1990 onto my 1986. One thing that made my life 100x easier was using the cross member that came with the transmission I was putting in, not the one that came with the truck. In your case, that would be using the crossmember from the 1986 on your 1990. Drive shaft lengths is another thing to be wary of.
I've done the opposite of what you're doing, I put a transmission from a 1990 onto my 1986. One thing that made my life 100x easier was using the cross member that came with the transmission I was putting in, not the one that came with the truck. In your case, that would be using the crossmember from the 1986 on your 1990. Drive shaft lengths is another thing to be wary of.
Fleet Mechanic
Joined: Sep 2016
Posts: 1,519
Likes: 224
From: Nevada
A clutch kit for a 90 would be for a ZF-5 pd which has a larger input shaft/splines.
Just order a clutch kit for a 86 F-250 4-spd trans.
I just ordered one from Parts Geeks, a Luk 12" part# 07-065.
$142.43 and final cost shipped $163.22
Charlie
Just order a clutch kit for a 86 F-250 4-spd trans.
I just ordered one from Parts Geeks, a Luk 12" part# 07-065.
$142.43 and final cost shipped $163.22
Charlie
Thread
Thread Starter
Forum
Replies
Last Post
dirty_diesel
1987 - 1996 F150 & Larger F-Series Trucks
1
May 13, 2013 07:27 PM
awhtx
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
12
Dec 10, 2010 10:23 AM
65fordy
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
3
Apr 26, 2007 09:17 PM
79bigblue
Clutch, Transmission, Differential, Axle & Transfer Case
1
Dec 4, 2001 08:39 AM
