700r4 1988 2-4 band burned only - Hot Rod Forum : Hotrodders Bulletin Board
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Old 04-21-2011, 08:02 PM
kag kag is offline
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700r4 1988 2-4 band burned only

Hi ya'll I am trying to figure out why my 700r4 works good 1,2,3, but when going to fourth gear it starts feeling like 3 and fourth are fighting each other. third time apart after rebuild only shows it burnt the 2-4 band everything else looks good. replaced band went through valve body with b and m instructions since it had been modified b4 I got the truck. My brother has rebuilt many 700r4s without ever having this problem. on the upside we are getting alot quicker at taking the tranny and transfer out. PLEASE any info would be appreciated.

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Old 04-21-2011, 08:40 PM
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I had a 4-wd truck once that burned the band after I went through it and I installed a shift kit. Think it was trans-go or B&m, not sure.
The problem I found after it burned the band out was the kick down bell crank hit the aluminum sleeve that the kick down spool rides in. It would not let the truck get a 2nd gear to low gear kick down a wide open throttle.
After grinding so much off the aluminum sleeve it would work fine and cured the problem. The people that made the shift kit helped me figure it out. This was back in the 80's so I can't tell you exactly what I had to do but the aluminum sleeve was the culprit and it came from GM with that problem.


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Originally Posted by kag
Hi ya'll I am trying to figure out why my 700r4 works good 1,2,3, but when going to fourth gear it starts feeling like 3 and fourth are fighting each other. third time apart after rebuild only shows it burnt the 2-4 band everything else looks good. replaced band went through valve body with b and m instructions since it had been modified b4 I got the truck. My brother has rebuilt many 700r4s without ever having this problem. on the upside we are getting alot quicker at taking the tranny and transfer out. PLEASE any info would be appreciated.
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Old 04-22-2011, 03:13 AM
kag kag is offline
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700r4 band it ?

Thanks for your quick reply. I will check this and let you know what we find out.Sure has been a hair puller.
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Old 04-22-2011, 06:03 AM
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Quote:
Originally Posted by kag
Hi ya'll I am trying to figure out why my 700r4 works good 1,2,3, but when going to fourth gear it starts feeling like 3 and fourth are fighting each other. third time apart after rebuild only shows it burnt the 2-4 band everything else looks good. replaced band went through valve body with b and m instructions since it had been modified b4 I got the truck. My brother has rebuilt many 700r4s without ever having this problem. on the upside we are getting alot quicker at taking the tranny and transfer out. PLEASE any info would be appreciated.
if its just the band that is burning up, then you need to check the travel of the servo. once installed, it should have around .075-.100. if its more, the servo pin is too short.
another possibility is the reverse input drum is tore up and is eating up the band, or the reverse drum could be warped from a o.e.m. band, and you have installed a wide band without making sure the reverse input drum was flat where the band rides.
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Old 04-22-2011, 07:11 AM
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IF just the band has burned up, besides the drum shape and condition;

I would want to know the size of 2nd gear servo, condition of the accumilator bore and piston for 2nd gear.

Servo will usually have numbers on it to indicate the size. There are at least 4 different OEM size servo's from lite duty 4 and 6 cylinder to V8 to HD V8 application
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Old 06-09-2011, 11:21 PM
kag kag is offline
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700r4 burnd band

turned out to be forward clutch drum had a non visible crack
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Old 06-10-2011, 08:06 AM
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Quote:
Originally Posted by kag
turned out to be forward clutch drum had a non visible crack

There's a plumber joke in there somewhere.
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