How exactly do I flush my 700R4? I've heard I'll have to disconnect the return line for that - is it inside the tranny or can it be done without dropping the pan? Somebody please gve me a detailed explanation of this.

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'88 IROC 305 TPI
Gutted airboxes
160 degree T-stat
Advanced base TPS voltage
Relocated IAT sensor
Momo steering wheel
Ram-air setup coming soon
Flowmaster muffler

 

the lines that go from the trans to the radiator. not sure if it's top or bottom line.

 

Correct me if I'm wrong but don't the lines from the radiator carry coolant to the transmission? I'm sure it can't be trans fluid.

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'88 IROC 305 TPI
Gutted airboxes
160 degree T-stat
Advanced base TPS voltage
Relocated IAT sensor
Momo steering wheel
Ram-air setup coming soon
Flowmaster muffler

 

The lines carry transmission fluid to the radiator and back to the transmission.

 

This is confusing. the radiator carries both coolant and transmission fluid?

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'88 IROC 305 TPI
Gutted airboxes
160 degree T-stat
Advanced base TPS voltage
Relocated IAT sensor
Momo steering wheel
Ram-air setup coming soon
Flowmaster muffler

 

What if you don't have a transmission cooler, or do all third gens have them?

 

i could be wrong but as far as i know every car ever made with an automatic tranny has a tranny cooler.. and yes they flow tranny fluid.. not coolant.

 

Thanks for the info. Where exactly do the lines connect to the radiator?

 

two metal lines on the passengers side of the radiator.

the tranny cooler is inside the radiator and it sealed off from the coolant. so the tranny fluid that runs inside from the two lines goes inside the tranny cooler and gets cooled off by the collant surrounding the tranny cooler.

 

If the fluid is a dark brown color and smells “well done”, it needs to be replaced. Flush the entire system, not just a filter and pan gasket service, which only captures about half the fluid. If you don’t have a flushing machine in your shop, take the vehicle to a transmission shop and have the job done there, minimizing the odds of a come-back.

In addition to fluid breakdown as a result of excessive heat, fluid which has been contaminated with coolant due to a leaking oil cooler is just as detrimental to the operation of the automatic transmission. If the fluid is a milky, pink color you need to flush the system completely. Coolant mixed in with transmission fluid causes the lining material on the clutch disks to flake off and the rubber seals will begin leaking, causing a drop in oil pressure to clutch packs. The result? Transmission failure.

The addition of an external, auxiliary oil cooler is always wise. Put it on and forget about most transmission overheating problems. If the vehicle is used for heavy-duty operation, you need to choose the proper oil cooler for the application.

Auxiliary oil coolers are available from many aftermarket suppliers.

 

Thanks for the info, anyone ever flushed out your tranny by yourself?

 

2 questions. Should I flush it first then drop the pan and replace the filter or should i do it the other way around? Second, when you are putting the pan back on, which side do you put the gasket sealer on? Also, does anyone know which line I should disconnect for sure? Guess thats 3 questions, oh well, lol. Any replys would be much appreciated!