Transmissions and Drivetrain Need help with your trans? Problems with your axle?

Input drum engaged to front planet

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Old May 17, 2020 | 01:13 PM
  #1  
zupta82's Avatar
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From: Utica NY
Car: 88 Trans Am
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3:42 open diff
Input drum engaged to front planet

I’m about ready to start figuring out my end play with the drum splined on the planet. Here is a video
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Old May 17, 2020 | 01:14 PM
  #2  
zupta82's Avatar
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From: Utica NY
Car: 88 Trans Am
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3:42 open diff
Re: Input drum engaged to front planet

Hold on everyone I don’t see the video is attached
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Old May 17, 2020 | 01:59 PM
  #3  
zupta82's Avatar
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From: Utica NY
Car: 88 Trans Am
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3:42 open diff
Re: Input drum engaged to front planet

Ok never mind I think I have it figured out the reverse drum is sitting below the pump gasket surface. I also am measuring the distance between the two drums right at the notched cutout. I hear this is a dirty secret, you should be able to get a stack up of feeler gauges that equal .150 in rather snug. Also here is a pic, when I rotate the input shaft the reverse drum is not on top of the bearing so I’m guessing I need a thicker selective washer


Attached Thumbnails Input drum engaged to front planet-3f9934f3-5755-4f92-88d8   Input drum engaged to front planet-f86924e3-dc72-4ebd-baf1   Input drum engaged to front planet-58831b44-70d4-4b95-a9e1   Input drum engaged to front planet-fb21de41-b640-4684-941a   Input drum engaged to front planet-ce393d5d-97f3-45d5-9b30  

Input drum engaged to front planet-5e44b675-1fad-4aad-b5ca  
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Old May 17, 2020 | 02:01 PM
  #4  
zupta82's Avatar
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From: Utica NY
Car: 88 Trans Am
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3:42 open diff
Re: Input drum engaged to front planet

Sorry I think I uploaded extra pictures my connection is kind of bad and I was going to add a video
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Old May 17, 2020 | 03:16 PM
  #5  
zupta82's Avatar
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From: Utica NY
Car: 88 Trans Am
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3:42 open diff
Re: Input drum engaged to front planet

Ok I measured my original selective washer it is 0.80 do I have to put my pump, band and servo in. I don’t want to ruin my Teflon seals from inserting and removing
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Old May 17, 2020 | 03:18 PM
  #6  
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From: Utica NY
Car: 88 Trans Am
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3:42 open diff
Re: Input drum engaged to front planet

I’m referring to the puzzle like notches between the sunshell and reverse drum
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Old May 18, 2020 | 05:30 AM
  #7  
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From: Tracy, CA
Car: '87 IROC
Engine: LB9
Transmission: TH700R4
Re: Input drum engaged to front planet

Here's the setup I used when I measured mine:



You do not need to install the band or the servo/accumulator. You do need to install the pump gasket.

I first measured the end play without the Selective Washer installed, checked the chart and choose the washer I needed to get the end play in spec (it needed a thinner washer then the original).

I installed the washer and checked again to confirm the end play.

I didn't install the Teflon Sealing rings until after the end play was confirmed. You should be OK if you don't bang the shafts around, it shouldn't take you more than 3 or 4 stabs to determine the washer you need and secure the pump.

Make sure that everything is sitting all the way down (working with the case standing up):

I put a square on the pump mounting surface and eyeballed how for below that surface the Reverse Input drum sat. No measurement was taken; just confirmed that it was below flush:



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Old May 18, 2020 | 06:57 PM
  #8  
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From: Utica NY
Car: 88 Trans Am
Engine: 305 TBI
Transmission: 700R4
Axle/Gears: 3:42 open diff
Re: Input drum engaged to front planet

Well I went back and mocked up the pump without the pump gasket and without the shaft lifting tool. I just used a thick rag with a vice grip it took a few tries. I tried setting up the dial indicator on the edge of the input shaft it was a little difficult but I made sure it returned to zero

1) with no washer I got 0.050 endplay
2) With 0.080 washer I got 0.015 endplay
3) with 0.110 washer I got no endplay
4) my gasket thickness is about 0.015

Im kind of drained on cost I know I should of bought the special tool. The thrust washer and selective washer kit that I initially bought were all supplied with too thick washers. Ultimately I used my original selective washer also here is a pic


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