tranny help!!!

[jordan281990]

Originally Posted by hotrodpc

And that is why I am suggesting check it out. I was not sure of the year, but heard something of the sort too. I had also heard, that GM went to the E trans one year, then back to the Non-E for 1 year, and back to the E again in half ton trucks. It could have been a differant model I am thinking of, it may have been in Vans, but it seems it was there in the 94 95 area, so what Kenny is suggesting, may be what someone was reffering to when they told me to be careful with that. I know in the 700r4/4L60 they are even differant harnesses for the 4 pin connector and the lock-up converter. I have an ATSG manual showing like 15 differant wiring diagrams for the 700r4/4L60 and thats not even the E controlled model. Now by the time they got to the controlled model, I do not think there were near as many and the wiring was fairly uniform and the exception may be the 95 as Kenny suggests. I am thinking if you get 96 or newer, you are completely out of the woods. Sure didn't mean to confuse you, but just so you know, it can be critical as far as proper operation.

well thanks guys hopefully its compatible. i ll have to go check the wiring connectors to make sure

[hotrodpc]

I found a little info you had better pay attention to. So I was curious as to this 95 being differant thing. It appears that the 95-97 models have what is called a PWM Pump system. Pulse Width Modulation, so check them out very closely. So now, I'd like to say, get the 98 or Newer to be on the safe side. Goes to show, you learn something new everyday. I kinda feel like I should have known this already, but I just happen to have done a bit of research and found it out.

[jordan281990]

Originally Posted by hotrodpc

I found a little info you had better pay attention to. So I was curious as to this 95 being differant thing. It appears that the 95-97 models have what is called a PWM Pump system. Pulse Width Modulation, so check them out very closely. So now, I'd like to say, get the 98 or Newer to be on the safe side. Goes to show, you learn something new everyday. I kinda feel like I should have known this already, but I just happen to have done a bit of research and found it out.

wow never heard of that, i ll deff check that out! thanks!

[hotrodpc]

Yeah, what I said, "WOW". Crab confirms that 95 does set all alone as its very own, so a 95 will only interchange with a 95. I know I shouldn't, but I am going to assume the reason for this is, 95 is the first year for PWM pump, but its also the last year of TBI, then in 96 GM went to SFI (Sequential Fuel Injection, which is Multi Port) so the ECM would have changed which is likley why the 95 stands alone, then if thats the case, you could also assume 96-97 will only interchange with themselves. I dunno for sure, just guessing.

[jordan281990]

Originally Posted by hotrodpc

Yeah, what I said, "WOW". Crab confirms that 95 does set all alone as its very own, so a 95 will only interchange with a 95. I know I shouldn't, but I am going to assume the reason for this is, 95 is the first year for PWM pump, but its also the last year of TBI, then in 96 GM went to SFI (Sequential Fuel Injection, which is Multi Port) so the ECM would have changed which is likley why the 95 stands alone, then if thats the case, you could also assume 96-97 will only interchange with themselves. I dunno for sure, just guessing.

thats what i would guess. apparently i better hope this is a 98 tranny.

[jordan281990]

do you know of ne websites for diagrams of a tranny or resourceful information. bc i plan on rebuilding my original in the future

[hotrodpc]

Just a bunch of places trying to sell "how to" books. Then there is this place that gives a diagram, but unless you know what you are looking at its not much help.
https://www.wittrans.com/Schematic.a...0E/4L65E/4L70E
Then you can click on each section it will break it down to a larger view per section.

[1500cheyenne96]

Hey hotrodpc after reading what you wrote got me interested so i did some diggin and found there is no difference it the drive lines of a 96,97,98 4wd truck the motors and trans are interchangeable though there were small tweaks between the years the internals were modified in 97 for better efficiency and reliability and in 98 the shift points were and TCC lockup were changed by 200 RPMS to help alleviate that lovely chugging when going up the slightest hill but the programming for running them remand the same.

[hotrodpc]

True on all that, but what about the PWM Pump in the trans and how will that affect the electronics? I understand that PWM Pump is for 3 years 95-97.

[1500cheyenne96]

OK wow i've been getting bed data for some reason this is right as far as i know 95's and 96's stand alone a trans from a 97 will fit a 98. 95 was the first year for the PWM pump but the electronis were differnt. Then in 96 when the went to the vortec they changed the pump design and electronics. Then in 97 they changed the trans yet again. the pump remained the same the bell was different and they went to 133mm converter They added solenoids and they went to the EC3 programing system witch changed the input and output feed to the ECU and that remand the same in 98 so as long as the trans comes from a 97 or 98 it will work.