Borg Warner 1356 oil pump modification

Moderator: Mod Squad

User avatar
Registered User
Posts: 765
Joined: Wed Jan 04, 2012 7:43 pm
Location: Las Vegas, NV

Borg Warner 1356 oil pump modification

Post #1 by MechRick » Thu Jul 19, 2018 9:56 pm

Since this is a common transfer case in Fords, and the failure can be catastrophic, I thought I would outline the problem and a workable fix.
My 1994's case had ~ 200,000 miles on it, including some recent trips to Sacramento CA and Dallas TX. I figured I was on borrowed time.

The (engineering) failure involves the oil pump locating tang, and a cast slot in the magnesium case. The tang wears through the case slot, allowing the pump to spin on the output shaft and not lube the case. It's a failure that gives no outward sign of trouble and will leave you stranded.


A welder and a short section of 5/16" brake line will spread the load over the entire slot.



I'll clean the case up and give it some paint before I bolt it back in.
You do not have the required permissions to view the files attached to this post.
1994 F150, 4.9L/ZF 5 speed, C-Vic police driveshaft
EFI head w/mild port work, 3 angle valve job
1996 long block, stock pistons, ARP rod bolts
Stock cam, aluminum cam gear
Hedman header, full mandrel bent duals, crossover, super turbos
Bronco II with a 2.3L swap
1988 F250 2x4, 460 ZF 5 speed.

Who is online

Users browsing this forum: No registered users and 5 guests