Tazman

Hi all,

My 98.5 seems to be "slipping" between the 1-2 shift. There is a definate "grrrrunnnt" at that point under hard acceleration.

It used to do it only on the downshift (2 to 1 dump) with a bit of boost/rpm behind it but will now slip occaisionally form a standing start. Truck runs/shifts fine otherwise.

I'm wondering, if it's clutches and not too far gone yet, will a performance VB take care of this? what about band adjustment?

Pushing 250,000 km (130,000 miles) on all stock driveline.

Appreciate any input.

Cheers,

Taz

RowJ

I think the 1-2 slip is unusual. Think the first sign is usually in OD. But Yes... and performance Valve Body would make a hugh difference.
I know a 425 hp 01 that was driven hard for two yrs with a stock converter and a DTT valve body!

RJ

Tazman

bump

Anyone else?

Fishin2Deep4U

with a 1-2 slip or flare, your days are numbered. That high of mileage, the direct clutch is most likely gone and in turn, so goes everything else.

Don't throw some parts at it. Get it rebuilt right the first time.

The above mentioned DTT is my choice as well.

Dave

flattracker

The direct clutch is not engaged in the 1-2 shift if flaring or slipping most likely the band . An adjustment may help short term, but with those miles band most likely toast,
It is rebuild time.

flattracker

The direct clutch is not engaged in the 1-2 shift if flaring or slipping most likely the band . An adjustment may help short term, but with those miles band most likely toast,
It is rebuild time.

robert78.5

I did the band adjustment and solved my shifting problems.

Fishin2Deep4U

The direct clutch is engaged in 1st, 2nd, 3rd and reverse.

Yes the front band is engaged for the shift, this is what causes it. But that's only the mechanism, not the end result.

He could have a multitude of problems. With that many miles, he's got internal issues. If he adjusts the band and has to go more than 3 turns, most likely the band is shot. If that is the case, he'll end up eating the drum at some point as the friction just starts coming off.

It may also be internal leakage and a lack of apply pressure at the front servo. And the list goes on. But I am betting this unit is tired and just needs a full rebuild.

Dave

Tazman

Thanks to all replies.

A complete refresh is a little out of my snack bracket right now. I would consider DTT components for TC, VB and their master rebuild kit installed by a pro.

Any thoughts with that approach or are we further ahead with the "whole 9 yards" from Bill Kondolay?

Cheers,

Taz

dozer12216

"The direct clutch is engaged in 1st, 2nd, 3rd and reverse."
In all my years with this tranny, have never heard the rear clutch called a direct clutch. The rear clutch is also applied in OD but not in reverse. The front clutch is applied in Reverse, 3rd (or direct), and OD. This is a 47RE.
Anyway, Taz, You are on short possibilities. On the band adjustment: If no threads are exposed above the jamb nut on KD band adjuster, it is worn out and as someone else noted a expensive drum is gonna be destroyed.
At least change fluid, filter and have someone examine for damage. A rebuild in in near future. Do not spend money on vb, ect without the rebuild.

Tazman

Thanks Dozer, I appreciate the advice and will heed.

As an update: I would have to say it's not really a slip. That being I don't see/feel an increase in RPM when this happens. It's a loud "grrruunnnt" as the shift happens. This is not gear knash......sounds like dragging a heavy wood table accross the floor for a second.

Is there any merit to this "2-3 bind up shift" that I've read about on DTT's site?

Cheers,

Taz

j-fox

Most definately!!! It is bind up. Timing of the front band release and front clutch apply causes and cures it.

Btw, some call the rear clutch the forward clutch others call it the rear clutch. Some call the front clutch the direct or front clutch.
Rear clutch is applied in all the forward gears.
Front clutch is applied in 3rd and 4th also for reverse.