Tranny help

TylerP53 · Jul 16, 2024

So when I put my transmission manually in 1st gear it revs high for a sec then feels like it’s shifting into 2nd. Then back to 1st. Anyone know what could cause this?

I only do it when I take it in the mud

Joseph Garcia · Jul 16, 2024

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

@NickTransmissions is our resident transmission expert, and he will chime in with his thoughts and perspectives.

NickTransmissions · Jul 16, 2024

TylerP53 said:
So when I put my transmission manually in 1st gear it revs high for a sec then feels like it’s shifting into 2nd. Then back to 1st. Anyone know what could cause this?

I only do it when I take it in the mud

If your rpms climb high enough in manual low, trans will force an upshift to second gear to protect engine and trans from damage. You need to do a gear command mod, which would give you manual low at any speed and rpm. Transgo reprogramming kits have these mods/parts so install that kit for your transmission and you wont have forced upshifts out of manaul low any more.

rockola1971 · Jul 18, 2024

If tranny is stock and has had no work done internally, it will not last long mudding. You will end up burning up the clutches.

Marky Dissod · Jul 18, 2024

TylerP53 said:
So when I put my transmission manually in 1st gear, it revs high for a sec, then feels like it’s shifting into 2nd, then back to 1st.
Anyone know what could cause this?
I only do it when I take it in the mud.

How fast are you going (MpH) when you shift manually into 1st?
You may be going fast enough to be on the pcm's border between 1st & 2nd.

Good idea to refresh ATF.

Tranny help

TylerP53

TYF Newbie

Joseph Garcia

NickTransmissions

Sin City

rockola1971

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Marky Dissod

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