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You should read up on drive shaft critical speed.I think there is a chart about it on mark Williams site.I have to admit i had no idea.

Well I chickened out on modify the pump but I was thinking about doing exactly what you did.If I ever switch over to a trans brake I may do that.Don't think my caribe bur would fit in between the sealing rings. I may just use the four pinion aluminum planet's being the steel set are a little...

Didn't know these were available or they had a problem breaking.My brother has a 904 converter that he used in the past that has a cracked hub.I was going to try it a some years ago but found the crack before I installed it.

No the $30 dollar ones.

Bought the a and a pump gears.

Okay that makes sense.

Well I don't do first gear burnouts.Only thing I can think is a few times that leaving the starting line my car spun and then hooked back up.This was maybe two tire rotations.

I didn't check the gear train end play but I'm sure your right it was way out of wack.

So just an update, I have installed a ati sprag,billit servos, 4.2 lever,multi front drum spring,blue frictions when done,red front band,kevlar rear band,new pump gears. Dropped off pressure plate at machine shop to have .025 taken off. Still debating purchasing a low band apply vb but still not...

So I got into this trans and in our big hurry to get back racing we must have forgotten the thrust washer in the planet's. Not sure if this affected how it shifted into 3rd but who knows.

There the steels that came with the frictions. Steels are .068.Are there thinner steels available?Snap ring is .060

So I was playing around with a four clutch drum and put in five blue raybestos frictions but only got .040 clearance.The blue frictions are .064 thick.I would think I need another. 020 clearance from what I've been reading. Can the pressure plate be milled down or are there other options? I...

Ok so it looks like the same concept of enlarging an engine oil pump passages.Thanks guys.

I have a pump in front of me is this it?

End play in input shaft is .041.I probably won't tear into trans till someone cleans this garage.

It's a 416,12.9:1 with flat tops,molnar crank and rods,modern cnc promax heads,small bullet solid 571 lift 251@50 cam,sv intake,950 qf carb.Would love to try a bigger cam but I'm maxed out piston to valve clearance. Car weighs 2900 without me. My local track is Mason dixon.Elevation is around...

Shift light is set to 6700 but time I pull a the shifter it's probably more.

Yes it's a rmv.

So removed trans this morning.Pulled vb and saw jc punched in this vb.Could this be john cope?I bought this new 28 years ago. The reason I brought up modifications to the pump is a&a and cope either sell or list this in 904 trans they sell.Thanks

Thank you

I thought it was odd that numbers in the book I have skip from starting with 38 to 40.

So I just pulled my trans out this morning and can match the numbers up on left side of pan rail.Anybody know what year this is?The best I can make out of the numbers is 392080a.The vin looks like 90286312.Thanks

It's the same one I bought new in 1992 that came in a tci box but had j.w. scribed on it.So I was told it was a winter's rmv.

Band is adjusted correctly.Not sure about the clearances but going to find out when I remove trans.In the past my buddy just used a standard rebuild kit but looks like time for better parts.I have heard about changing the front drum spring to a multiple spring pack and modify pump for more...

Not sure of the power but has run 6.49 in the 1/8 for a best and 10.29 in the 1/4.

I have been using 904 transmissions for about 25 years and haven't had any major issues till recently.So with the added power that my cars been making I lost the sprag last year.Then we took the guts out of it and reinstalled in another case but now it slips going into third.So I figured it...