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Discussion Starter · #1 ·
Help!

I have owned and driven as my primary vehicle a 77 Bronco since 1980. During that time I have rebuilt or replaced many engine, drive train and body parts. When my transmission died recently, I purchased a rebuilt C4 and converter. The installation went as expected but when I put it gear the first time... nothing happened. There is no indication that the transmission is engaging in any gear. With the engine running I can hear a clicking or rattling sound under the bell housing.

Before installation I flushed the cooling lines, primed the converter with 2qts of ATF, and the vacuum modulator seems to be working.

I suspect perhaps the wrong input shaft for the converter? or maybe a bad torque converter?

Any ideas?

Thanks
 

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It could be the pump on the trans, or it could be the torque converter or even the gears on it. Im as far away as an expert as you could get, but you might want to check those things out and hopefully someone else will respond. Im extremely worried and afraid this is gonna happen to me when i go to rebuild and put mine in.
 

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Discussion Starter · #3 ·
Thanks Melkorr,
I hope it's not the transmission pump. Given my limited resources, the rebuit was a PITA to install. I don't want to to remove it again until I have a few ideas of what to look for.
Dan
 

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A quick check,remove one of the cooler lines and check for flow.A pressure gauge would be better ,no pressure


You could remove the convertor nuts and just check if it is free or tight might show ??????

<font size=-1>[ This Message was edited by: gregaust on 3/17/06 6:43am ]</font>
 

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My guess is the convertor is not seatted into the front pump housing completly

when you put the convertor on did you notice it dropping in 2 or 3 steps onto the input shaft?






_________________
Just a Little Roots Blown 306. "Keep your Foot in the Stirrup and strap your Butt in the Saddle this ones no Pony Ride.

<font size=-1>[ This Message was edited by: Noslo50stang on 3/17/06 8:20am ]</font>
 

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I would pull the trans and put input shaft in converter and see if splines match.
Unfortunately if you didn't have the converter seated when you started the motor you're going need a pump and converter.
 

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Discussion Starter · #7 ·
Thank you for the responses.

Is the converter supposed to drop in 2 or 3 steps? I'm sure it only dropped in 1 or maybe 2 steps when I installed it.

This sounds like it might be the problem. What kind of damage am I looking at if the converter was not fully seated when I started the motor...remember I did hear a clicking or rattling sound under the converter when the motor was running.

Dan

<font size=-1>[ This Message was edited by: 77EB on 3/18/06 12:16am ]</font>
 

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I'm not positive on the order of steps, but you do have to engage:
the input shaft splines
the one way convertor clutch splines over the pump snout
the convertor snout flats into the pump inner gear
I'm thinking that it is common to not engage the convertor snout into the pump gear and when you tighten the bell bolts you jam the snout into the gear, thus creating the need for a new pump.
The key is to assure that the convertor can slide back and fort a wee bit before you snug up the bell bolts or the flexplate bolts/nuts. At this point crawl under there and remove the flexplate bolts/nuts and see if you can get the convertor to move fore and aft. If not, she's bound up. Time to drop it and assess the damage, if any.
 

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Discussion Starter · #9 ·
Thanks R Code and others,
I am on my way now to follow your suggestions. I'll let you know how it turnes out.
Dan
 

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Discussion Starter · #10 ·
Well, you all were absolutly right. The converter snout flats were not seated properly and got severly crunched.

I understand that I will now need a new converter and front pump.

Does anyone have a good source for these parts?

Some advice on installing the pump?

Are there other parts that may have been damaged?

Thanks,
Dan
 

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Ah well, sorry that happened.
I'd source everything locally. There is a convertor place here who can put a new snout (I know that is not the right term) on the convertor for a reasonable price and there is a place here called "Trans Parts Inc." that sells tranny parts new and from a large stock of parts trannies. When I upgraded some internals to C5 stuff I got them there. You probably can do the same where ever you are.
 

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Discussion Starter · #13 ·
Thank you for your advice.

I finally got a new converter and front pump installed. The good news is the truck now runs well through all gears. The bad news is it will not start in Park and I have no Parking gear. When selector is in Park and the truck is rolling, I can hear a click like the pawl is trying to engage?

I believe all linkage is adjusted properly and I adjusted the neutral start switch per instructions. Also, the reverse lights don't work.

Are these problems related or do I have multible issues?


<font size=-1>[ This Message was edited by: 77EB on 6/11/06 6:09am ]</font>
 
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