TRNW-2: 10R80 pump bolts

[Randolph Wilson]

There are many reasons a manufacturer will call for new bolts.  Most common is because of a special coating on the bolts. The coating can be a sealer, a locking agent, or an anti-corrosion lubricant (think magnesium cases). They can also be torque to yield. The one thing about TTY is they will always be protractor torqued. Not all protractor torqued bolts are TTY, but TTY will always be protractor torqued.

In this case Ford calls for replacing them because of the sealer.


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Randy Wilson
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From: trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> On Behalf Of Dan Hogan via trnw2
Sent: Friday, February 14, 2025 1:11 PM
To: Technical Discussion Forum <trnw2 at trnw.net>
Subject: Re: TRNW-2: 10R80 pump bolts

Steve,

These factory pump bolts appear to be TTY (torque to yield) and are one and done.  I suspect if you decided to re-use, using the factory torque spec likely will be too low as the bolts stretch once and deform.

I know the transfer case to transmission bolts are definitely TTY and the factory torque spec is very low.  I don't think shops are replacing as needed, but it's likely a bad idea.  There's nine of them so guess they cross their fingers, pray and blame later.

I wish makes would not use these type fasteners as it only introducing errors and mistakes in the aftermarket to already expensive and costly work.  Blame the eurotrash as they started this mess with TTY on likely unnecessary areas of vehicles.  Cheaper i guess.


---



Dan Hogan

Buster's Transmission Service

https://busterstransmission.com

704.847.5321

________________________________
From: trnw2-bounces at trnw.net<mailto:trnw2-bounces at trnw.net> <trnw2-bounces at trnw.net<mailto:trnw2-bounces at trnw.net>> on behalf of Steve Everett via trnw2 <trnw2 at trnw.net<mailto:trnw2 at trnw.net>>
Sent: Friday, February 14, 2025 10:55 AM
To: Technical Discussion Forum <trnw2 at trnw.net<mailto:trnw2 at trnw.net>>
Subject: TRNW-2: 10R80 pump bolts

anyone had any issues with reusing the factory 10R80 pump bolts ?  I've reused them on a couple units with no problems, I've tried using the ones that come in Precision kits, but their seal is nothing but silicone, which smashes and destroys itself after initial tightening ,  looks cheesy to me, I trust the factory bolts over them,  as long as you don't over torque them

  Steve
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