helicoils will fix the stripped holes, they should have put helicoils in to begin with. Threads in aluminum should always have helicoils installed from factory
2004r to 700r4 transmisson swap?
- Thread starter Tylerb23
- Start date
- Status
I would use a quality pan gasket and NO sealer. Make sure the pan flanges are straight and flat.
I second this never use any sealers on the trans pan, just good quality gaskets, clean clean clean the pan and trans mating surfaces. As said insure the pan bolt holes are flat and do not over tighten the TV cable bolt or trans pan bolts
Put some trans RTV on the bolts. That's where it's leaking. Been there, done that.
if you have stripped threads adding RTV will not allow you to get the proper torque on the bolt. I like heli-coils the best to repair threads but this product also works well if you go by the instructions
when i 700r4 swapped mine i needed a diff driveshaft and cross member, i dont get why everyone hated on the question so much, i went 700r4 as 1st was more aggressive and 4th was more highway oriented which was what i wanted. all i needed was the crossmember i had a driveshaft made and i needed the correct gears so my speedo was correct. honestly i like the 700r4 more afew more parts are available.
Last edited:
The bolts weren't stripped. The fluid was sneaking past the gasket into the pan bolts. This is on an aluminum pan but will work just as well with a metal pan. No issues after the treatment. Actually I only did it on about 4 or 5 bolts that were the culprits. This is on a trans that was built by one of the top TB 200r gurus. The tip came from another TB trans guru.
The 700r4 has a steeper od than the 200r4. The 200r4 often wins in the swap discussions because it came in the cars and all that really needs to change is a crossmember and the correct throttle cable and TV cable brackets.
TH2004r has a .68 OD and the TH700r4 has a .70 OD. the lower the number after the decennial point the steeper the OD (slower the motor turns)
700R4 VS 200-4R Similarities
These two transmissions are so similar, it’s almost a wonder that the factory produced them both.
TV Cable
They are both controlled by a TV Cable, which is a big upgrade from the old kickdown cable of old found on the TH350 and TH400. This TV cable basically acts as a primitive throttle position sensor, which allows each of these transmissions to shift smoother and stay at the best rpm possible for peak performance and fuel economy.
The TV Cable is known to be a little finicky. Is is one of the most common 700R4 problems. If it’s even out of adjustment a little bit, it can cause the 700R4 or the 2004R to shift really hard, really early, or really late.
Overdrive
They both have overdrive gears, which is a first for GM automatic transmissions. It was ground breaking at the time. Todays modern 4L60E is a direct descendent of the 700R4. This basic design and .70:1 overdrive gear are still present in it with minimum changes. The 2004R is a bit more aggressive with a ratio of .67:1.
700R4 VS 200-4R Differences
Gearing
The overdrive gear in the 2004R is .67:1, which is a bit more aggressive of an overdrive than the 700R4. This means that the rpm is even lower when driving down the highway with the 2004R.
| Gear | 700R4/4L60 | 2004R |
| First | 3.06 | 2.74 |
| Second | 1.62 | 1.57 |
| Third | 1.00 | 1.00 |
| Fourth | 0.70 | .67 |
As you can see, the gear ratios of the 200-4R are closer together than the 700R4, which makes it a better transmission for drag racing.
Attachments
Last edited:
- Status
Similar threads
