is it the dreaded box

Bemble · Apr 24, 2013

Your transmission should failsafe to 5th gear, so the fact that it stays in 3rd even when TRANS FAILSAFE PROG is displayed indicates that its mechanically unable to select 4th and 5th gears which, in the case of the GM 5L40-E transmission, points to an issue with the direct clutch drive to the rear epicyclic carrier assembly. By far the most common cause of this is the shaft shearing off where it attaches to the drum. The shaft is manufactured like the inside of a toilet roll and it unwinds and then shears off.

I would suggest that you take the sump off and look for any metallic debris on the magnet.

Saint.V8 · Apr 25, 2013

Told you Bemble (RRPhil) was a fecking genius didn't I..???

2.0_hippo · Apr 25, 2013

saint.v8 said:
told you bemble (rrphil) was a fecking genius didn't i..???

:d

ozzyboy · Apr 25, 2013

he is the man.all info to hand.
box gone for repair should know in the next day or so just how badly damaged it is

ozzyboy · May 1, 2013

brief update
bemble was bang on the button as usual. thanks very much for that.

box stripped and the shaft had gone west.
hope to have it repaired and recond this week.

ozzyboy · May 8, 2013

all done and dusted.drives like a dream.

thanks again for the advice guys

speedyyellow · May 9, 2013

Nice one, this seems like a good way to buy one as presumably you ended up paying less than you would have for a fully working vehicle, yet you know that yours has a sound 'box.

Saint.V8 · May 9, 2013

:5bparty:

Deasy · May 9, 2013

Good work!

I love it when I plan comes together!

Rr13269 · Oct 24, 2019

Bemble said:
Your transmission should failsafe to 5th gear, so the fact that it stays in 3rd even when TRANS FAILSAFE PROG is displayed indicates that its mechanically unable to select 4th and 5th gears which, in the case of the GM 5L40-E transmission, points to an issue with the direct clutch drive to the rear epicyclic carrier assembly. By far the most common cause of this is the shaft shearing off where it attaches to the drum. The shaft is manufactured like the inside of a toilet roll and it unwinds and then shears off.

I would suggest that you take the sump off and look for any metallic debris on the magnet.

Rr13269 · Oct 24, 2019

Hi bremble what if no metal bits in the sump as been changed and new filter and oil

is it the dreaded box

Bemble

Well-Known Member

Saint.V8

Dyed-in-the-wool 100% RR Junkie

2.0_hippo

Well-Known Member

ozzyboy

Active Member

ozzyboy

Active Member

ozzyboy

Active Member

speedyyellow

New Member

Saint.V8

Dyed-in-the-wool 100% RR Junkie

Deasy

Well-Known Member

Rr13269

New Member

Rr13269

New Member

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