Slips in second gear.

[dyermullet]

My trans slips in second gear. Anymore than 1/8 throttle it won't even shift into 2 if you let your foot off the accelerator completely it will go into two but then as soon as you accelerate it will slip.
I need some advice.

the factory manual says in this order.

Spacer Plate & Gaskets
Accumulator Valve
1-2 Accumulator Piston
Intermediate Band Apply Pin
Intermediate Servo Assy.
D Throttle Valve Cable
Throttle Valve
T.V. Limit Valve
Line Bias Valve
Intermediate Band

I need some advice on how to start troubleshooting this. The only thing on a car that I have never rebuild is an automatic transmission.

 

[Quick6'n'-K.C.]

So if normal driving, the car will go thru all gears with no issues?

Or..

When driving normal, car shifts from 1st past second and into 3rd, 2nd acts as neutral?

Or..

Can you drive the car, and when it normally shifts to 2nd, can you hold second gear with the gear selector and see if it actually slips with throttle only in that gear, or find out if the slipping does it in all gears?

If the 2nd gear apply pin breaks, you will not have 2nd gear and it will feel like it slips, but actually the car shifts from 1st to 3rd, pull back the gear selector and if it acts as neutral, the 2nd gear band broke, either the anchor pin or right off the band.

Jump in the car right now and let us know what you find, you have about 41 minutes to get back to us:smile:

BW

 

[dyermullet]

So if normal driving, the car will go thru all gears with no issues?

Or..

When driving normal, car shifts from 1st past second and into 3rd, 2nd acts as neutral?

Or..

Can you drive the car, and when it normally shifts to 2nd, can you hold second gear with the gear selector and see if it actually slips with throttle only in that gear, or find out if the slipping does it in all gears?

If the 2nd gear apply pin breaks, you will not have 2nd gear and it will feel like it slips, but actually the car shifts from 1st to 3rd, pull back the gear selector and if it acts as neutral, the 2nd gear band broke, either the anchor pin or right off the band.

Jump in the car right now and let us know what you find, you have about 41 minutes to get back to us:smile:

BW

ok to answer all the questions.

It will go into all 4 gears but will only go into 2 if I let off the throttle completely. So I definitely wouldn't call that no issues.
It does not shift past second into third, if I accelerate fast enough in first then it will go into third gear and then 4th, but other wise when I let off the throttle it will go into second and will accelerate in second if I drive about as fast as my 90 year old grandmother.
It seems to only slip in second gear.

I would have to go home to try driving the car again. I will put the shifter in 2 and see what it does but I know it will accelerate in second but with no more than barely over idle throttle opening.

Does that mean the pin more than likely isn't broken off? Last time at the track the trans started shifting slow into second gear, and it has just continued to get worse until today.

 

[Quick6'n'-K.C.]

I purchased a car about a year ago with a broken second gear band, it acted kind of like your car and what you are describing.... Once it shifted, i thought 2nd was sluggish, and it actually was 3rd gear.

So go drive the car and pull back the gear selector to 2nd, thats the only way for me to try and help you out, if you have any issue with that band, its probably toast and the trans will need to be freshened up.

Pull it into second about 30 and if its neutral, the band is broken.

The second gear band pin can break totally disabling that gear, and the servo pin needs to be set correctly for the band to APPLY, if not that gear will slip and eventually not work.
BW

 

[dyermullet]

Ok I will try it tonight or tomorrow but I can tell you that with light throttle from a stop 1 shift into 2 shift into 3 shift into 4 then the TCC will lock up (only locks up 4th gear at 50+mph how I like it :smile

 

[Quick6'n'-K.C.]

When you test drive it, see if each gear will hold a load, if you only have a issue with one gear, it will be easier to diagnose.

Hope to figure it out

BW

 

[dyermullet]

1 3 and 4 would hold a load. Only 2 would not. 3 would only hold half throttle or so because anymore would make it want to downshift into 2.

 

[dyermullet]

Confirmed
1 3 and 4 are fine, the car will accelerate in 2 very very slowly.

So what should I be looking at now? The intermediate servo? or the accumulator?

 

[dyermullet]

Alright guys I need some advice from the more experienced than I. What should I go after first?

Accumulator Valve
1-2 Accumulator Piston
Intermediate Servo Assy

The TV cable is adjusted correctly and seems to travel smoothly with no binding, and my transfluid is still a bright red color not burnt smelling or browned, plus I have nothing to loose inspecting the Servo and the Accumulator.

I am going to the NMRA race in Joliet this weekend and then monday I am going to start tearing into this transmission.

 

[77 cruiser]

Start with the servo, check the travel. How far can you push the cover in? Or put a guage on it & see what the press. drop is when it shifts to 2nd.

 

[dyermullet]

Ok so setup my dial indicator and just measure how far I can depress the cover? I'll give that a try tomarrow and report back.

For the pressure gauge that is a tool i have been wanting to invest in. Any suggestions on a good brand, I would probably be looking for a good middle of the road quality gauge because of the $$$ factor.

quick internet search brough up this on the first link.
ATD Tools 5550 - Automatic Transmission and Engine Oil Pressure Gauge Kit
I'll ask around to first and see if I can borrow one from a friend so I can check this tomarrow. My plan is to have this diagnoised by friday if the trans is fixable or if it needs a complete rebuild.

 

[bison]

Alright guys I need some advice from the more experienced than I. What should I go after first?

Accumulator Valve
1-2 Accumulator Piston
Intermediate Servo Assy

The TV cable is adjusted correctly and seems to travel smoothly with no binding, and my transfluid is still a bright red color not burnt smelling or browned, plus I have nothing to loose inspecting the Servo and the Accumulator.

I am going to the NMRA race in Joliet this weekend and then monday I am going to start tearing into this transmission.

Get a pressure gauge and check pressures while shifting at cruise. Report back.
Band lug or anchor may be broke.