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Post by BowtieGuy on Jun 10, 2004 15:54:53 GMT -5
The 700r4 overdrive transmission is a good transmission. And if built right can withstand a good amount of torque and horsepower. First off there where two versions of this tranny. 1986 1/2 and older 700r4's are commonly refered to as the small shaft. The input shaft has 27 splines. These trannies are good if you don't plan to build large amounts of power. I currently have one of this in my truck and works good. The newer version is commonly reffered to as the big shaft, having 30 splines on the input shaft. These trannies are the most desired when mating to an engine with large amounts of torque and/or horsepower. If you plan on building a tranny and looking for a core to build it with the look for a 4 wheel drive case. The bell housing area of the case is thinker than the 2 wheel drive versions. Some tips to making the 700r4 last are as follows
1: Make sure you have the T.V. cable adjusted properly 2: If towing or running modified engines I would suggest running an external cooler after the radiator. 3: Corvette servos will make it shift harder but also quicker. The quicker the shift the less slippage in the clutches, reducing the heat therefore extending the life of your tranny. 4: If your running a carberator other than stock, make sure you get the bracket for the carberator your using to hook up the T.V. cable to work at the right articulation. I have personal experience of burning up a good 700r4 by not having the correct articulation. 5: Make sure the transmission is locking up in overdrive. If not there are several companies that sell a kit to hook up and make it lock up right. I did mine without a kit, it was cheap and fairly easy. If you want more info on this fell free to send me a message or leave a post and I will try to explain it. 6: DO NOT TOW a trailer in overdrive.
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Post by Squidward on Jul 24, 2004 8:25:39 GMT -5
That is excellent info for all of us to know. Thanks for the great input.
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Post by BowtieGuy on Jul 24, 2004 23:12:31 GMT -5
:agree: Thanks Squidward I try to post info that will be useful for beginner wrenchers as well as advanced. :givebeer:
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Post by johnnyb1141 on Nov 4, 2004 21:41:26 GMT -5
My '85 has the ecm disconnected and is carburated. The tranny wasn't locking up at all at first and then after lots of messing with it I gave up and took it to a tranny shop. They played with it three or four times and now the tranny locks up but not often enough. Any more info on this subject would be greatly appreciated. Oh and what comes in these kits your talking about and where can i get one? Thanks for any help you can offer.
JB
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Post by jmc10002003 on Nov 6, 2004 18:13:06 GMT -5
i have an 87 4x4 with a 700r4 when ever i shift into reverse the fluid just pours out of itthis is the only time it happens tho?any ideas?i don't know enough to tear it apart but i can remove it if it is something easily fixed?
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Post by Missgoodwrench on Nov 6, 2004 22:14:07 GMT -5
I was always told to not usse the over drive around town, only on the freeway. Is this true, and how can you tell if the tranny locks up in O.D?
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Post by BowtieGuy on Nov 8, 2004 21:26:48 GMT -5
Basically the kit comes with a normally open switch that goes in the valve doby and wire and fuses. I got the switch from a local tranny shop and did it myself. It isn't very hard to do. Read the article on rewiring the tranny without a kit, you can do it real easily and save lots of money.
As far as fluid coming out only in reverse that has me puzzled. I am not good and transmission rebuilding and trouble shooting most stuff but some things I can help with. Don or Squidward might be able to help out on this one.
And no I would NOT use overdrive in town, especially with a 4x4 and oversized tires. Use it for highway use and it will make the tranny live longer. To tell if the tranny is locking up in overdrive, it will fell like a shift into 5th gear like. Lock up is almost immediately after shifting into overdrive.
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Post by Bent on Nov 11, 2004 17:44:47 GMT -5
My buddy and and I recently tore into his 86 jimmy and we found out some things. First off the bell housing on the top of the tranny right where it mates to the motor is missing a chunk. and second the flywheel cover was cracked around a bolt that we couldn't remove. So my questions are:is the hole in the bellhousing a big deal? And Can anyone suggest a good place for a replacement cover for the flywheel cover? He really likes chrome ones. Ok.... I guess I can find out about the cover for the flywheel by myself, I'm just lazy today....Can't reach the lmc catalog from my chair.
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Post by Missgoodwrench on Nov 11, 2004 19:44:41 GMT -5
I'm glad I asked I never would have known those things. Now is it not a good idea to use overdrive around town even with cars?
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Post by BowtieGuy on Nov 13, 2004 18:53:15 GMT -5
Most people do use overdrive around town. What they don't realize is it don't help save that much in gas if your driving 35 mph and less and does put more wear and tear on the tranny. But it really depends on the car's setup and driving. If your driving around and the tranny shifts into O/D and stays then its ok but if it shifts into and out of O/D while driving alot it causes more wear and stress. I know its true more on the 700r4 shifting into and out alot. :nope:
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Post by Missgoodwrench on Nov 15, 2004 19:22:49 GMT -5
That explains a lot! Thanks for the advice.
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Post by Bent on Nov 16, 2004 18:16:49 GMT -5
Anyone know if a chunk missin' ouy of the top of the bellhousing is a big deal?
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Post by BowtieGuy on Nov 17, 2004 19:12:59 GMT -5
If its a stock engine, and it isnt getting abused it should hold up ok. But if its modified or gets abuse it will cause problems sooner or later.
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Post by Bent on Nov 17, 2004 23:40:54 GMT -5
Thanx! ;D
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Post by johnnyb1141 on Dec 1, 2004 21:25:49 GMT -5
How'd you manage to lose a chunk out of your bellhousing?
JB
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