ya i will get the axles and all the brackets but dont think i will be using the tranny due to it needs many things to get it up to taking the torque . but we will see on monday what i will go I called CPT the first person i called art car is not him they bough his name basicly but when i did call him he said to call on monday thats when the guy could tell me what i needed to do .

Heres another article on the th200-4L
http://chevyhighperformance...rive-gear/index.html

I might give it a try but that 325-4l still makes me nervuse

Any leads on an engine?

not realy just a bunch of 400 pontiacs but i might go with that then get a stroker kit

well i went to the junk yard got a thm 325 differential and like i thought it is female and i counted the splines once it cam out to 27 splines. it looks good like i can get a common GM 27 spline output shaft for the thm425 make an adaptor plate and life will be good.

quote Originally posted by engine man: well i went to the junk yard got a thm 325 differential and like i thought it is female and i counted the splines once it cam out to 27 splines. it looks good like i can get a common GM 27 spline output shaft for the thm425 make an adaptor plate and life will be good.

What is the spline count and diameter of the 425? and where do you find the 27 spline for the 425?

aftermarket vendor have the output shaft . I am gona swing by a tranny shop and see if they have a old output chaft to see if it fits the differential just to make sure

now that i feel i have my dilemma for the tranny is over i will need to find the engine . I will be taking a break from this project due to i am about to get a formula that needs work and would like to get it on the road and show it has 910 origenal miles but has been siting for years outside

[This message has been edited by engine man (edited 12-15-2009).]

Looks like your breaking new ground here with the output shaft and all, way to go, good luck on the formula.

I dont know where i saw a THM325 differential but it was on one of these forums so that gave me the idea and then just had to check out the shafts spline . thanks for the good words of support

[This message has been edited by engine man (edited 12-15-2009).]

well i got a 3/4 inch thick pice of aluminum and have drilled the the 425 pattern on it and i need to get it bored for the 325 differential then i can drill the holes for it should be done after the new year

You might want to hold off on building the diff rotation spacer until tou bolt you engine up being from what I was told, at least on a sbc that the axle through the pan location has to pass under a main cap, or you may end up with your diff in the wrong spot, where you axle will run into a rod. I drew a pic for better understanding.

[This message has been edited by AmericanMuscle (edited 12-23-2009).]

not doing a SBC I wanted a pontiac but the dam things are so hard to find not much for 455 bt there are some 400 . I am considering a 500 Cadillac engine for it make a real monster

quote Originally posted by engine man: not doing a SBC I wanted a pontiac but the dam things are so hard to find not much for 455 bt there are some 400 . I am considering a 500 Cadillac engine for it make a real monster

I realize your not doing a sbc but the concept is the same, probably even more so being the pontiacs main journal is most likely bigger.

i will take a few mesurements to see if there will be problems

Just measure everything.
My 425 RR shaft hits the #2 cyl rod on the GN engine so I had to make a 2" spacer between the bellhousing and crank-flywheel.
Now it sits right below the #2 main.
The spacers costed me in aluminium and labour about 100$ total.

well like i said i will just rotate the differential till that axle misses every thing i havent drilled the adaptor that i am building for the 325 differential that will be used on the 425 tranny

Hi i know that i havent posted anything on this project but it is not dead just working on the 88 formula to get it into shape then i will back on this project

just thought i would post this project not dead i should be starting back on it in a few weeks

I have a cradle that was set up for the 500 ci caddy/425. send me a e-mail and i will send pictures. the builder used big bearing spindles and 325 axles ( with a adapter plate ) with the 425 diff. He swaped the spindles side to side to put the tie rod in the front. Never saw it with the engine, I got it after the engine was gone. I thought about using a BBC/425 in a home built car. The thought that I had was to move the MOTOR away from the trans just enuff to get the axle to run behind the oil pan. I was going to use 2 of the chevy-to-PBO adapter plates with long spacers welded in for the bolts to run through, ( realy long bolts) and a long peice that would go between the crank flange and the flex plate. Moves a lot of weight to the front, simple, but would not fit in a fiero with the stock wheel base.
www.frwihall@aol.com
The outer ends of the 325 axles will fit in the big bearing spindles. Give up on the handling and go for a wheely car!

the engine in my car is going to be mounted backward so the damper and pullys will be facing the back of the car . how i am doing this is using the TH425 tranny with a Diff from the TH325 flipped. I have orderd an output shaft for the tranny with the right spline and I am making an adaptor plate for the diff . I would have liked to use a 454 chevy or even a pontiac 455 but i have the Olds 455 so i just need an oil pan for it . I think i the future i will destroke to 425 but put turbos or a blower on it

well i was going to go with the Olds till today when i found a 70 eldorado with a 500 inch engine and 400 hp and 550 torque i think if i just change it over to fuel injection then i can bump the torque up a bit .

[This message has been edited by engine man (edited 03-15-2010).]

You will never hook up what it's got now. The set up I have used the stock 84? 325r4 axles and the spindals/brakes from a "A" / "N" car with the big bolt pat. stock fiero ball joint/tierod end fit. Years ago I bought a holley 950 fuel injection kit ( universal ) it came with 2 undriled fuel rails and 8 cups to put in the intake runners for the injecters. But you have to have a intake with all the runners on the same plane.
When you get it running, and are going to work the motor hard, take some vid, it should be interesting.

The 500 caddy in the mid 70's was offered with a port fuel injection intake manifold.
I would scrap all the electrical bits and convert to later model electronics/injectors, but that would give you the intake, throttle body and fuel rails.

i know that they had that fuel injection but hard to find so i will go carb at first and as far as hooking it up i know it will spin the tires at will but it will be a show off deal maybe go drifting lol

well i started to pull the 500 but it was froze up could not get it to turn over so not sure what engine will endup hooked to the tranny

I got the new output shaft and it fits just like i thought now you can do a th425 with a 325 diff flipped the last part will be making tha adaptor bt thats not that big a deal. i will post pic tomorow

Ok some pics of the th400 output shaft with the th350 27 splines you will see it fits in the th325's differetial perfect so this will fix the problem having a strong tranny and being able to flip the differential over

[This message has been edited by engine man (edited 03-27-2010).]

below is somthing copied not sure this would work some one who knows trannys pleas tell

simple reverse rotation to me involves, NOT making an upsidedown diff adaptor plate and then fabricating an oil pan (resulting in extra drag from the fluid in the gears), but rather using a turbo 400 drum and planetary set and wile your at it get the six clutch drum.The gears are cross cut the other way on the rear wheel drive tranny and will reverse your rotation.flip the intermediate sprag over so it clutches the drum the other dirrection.

When you reverse rotate the diff by altering the transmission internally the torque of the pinion pushes the ring gear backward exactly as if the car were shifted into reverse only the car will do 120 MPH in reverse (wich is actually forward because the drive train assembly is spun a 180.).Question is will the diff hold up to this eccelerating torque and mph in that the cross cut of the gears are now trusting what used to be the minor thrust side.

When you flip the diff you trust the side of the gears that were always the primary thrust side any how. Problem is are you now over lubricating the diff and creating a hydrolic wedge of friction between the gears.

on a 400 tranny the tailshaft faces the back of the car, on a 425 trans the tailshaft faces the front of the car. the 425 internals are the same as the 400 so parts can be swaped the only difference being the reverse rotation that the 400 parts would provide. more specificaly the planetary set and intermediate spag orientation. i havent done this or built a reverse rotation car but have talked to people that have. i would get a 400 core and a 425 tranny and open them both up, lay the parts out in two rows like an exploded view. then compare one to the other and substitute the reverse rotation parts. this would be plenty strong as it is in a 400 but again i dont know the design critieria or strength surrounding the issue of reversing major load to minor load on the ring and pinion gear surfaces

All the above from a guy, bigblock fiero on the forum.
As far as I know, this was proposed but never fully investigated

David Breeze

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Pantera Rebody Kits

The internals ARE the same. I'm right this moment building up a 425, and bits from 400 work.
drums, frictions, steels, needle bearings, center support etc.
I have already done dual-feed mod and right now I'm trying out a transbrake idea that I thought out.

I gota get the rest of my things from FL . I am looking to do a caddy engine might even bore & stroke it out to 572 that would be fun