700r4or 4l60 which would you go with?
01-11-2008, 04:20 PM
#1
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700r4or 4l60 which would you go with? hey im tkain out my 6 speed and trying to figure out which tranny to go with i need yalls help in desiding which one to get?
01-11-2008, 04:28 PM
#2
Durability wise they when built are identical, The 4L60E does offer tunability where the 700R4 must be done mechanically with govenor and or valve body springs, Even with the full manual versions the 4L60E offers the abilty to have presure control at various throttle positions through a vaccume modulator set up.
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01-11-2008, 04:50 PM
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i have a 6 speed in there now i want to also do high way runs but i heard if you go with the 4l60e you have to re do your wiring harness and i dont knwo how to do that unless you do. i have a 408 low compression motor with a procharger and nitrous also have a 9' rear end
01-11-2008, 04:54 PM
#5
I do know how to do the conversion. It is complicated but can be done. There is a very important overlay harness built by Speartech that needs to be plugged into the PCM. I do not recommend that just anyone make this installaiton though as damage to the PCM or transmision electronics would be the result if it were not installed correctly. There are other electrical considerations to be made as well... The neutral safety switch, reverse lights etc...
How much boost are you pushing?
g
How much boost are you pushing?
g
01-11-2008, 05:04 PM
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i havent put it on yet but probrably 8psi i just wnated an automatic that will hold up to all this power i really wnat a 4l60e but dont know how to do the electronics maybe i should just go with the 700r4
01-11-2008, 05:20 PM
#7
Well that certainly is an option. Another option to consider is the Manual Valve Body 4L60E. It does not require electronics... other than lock up which in a worst case scenario can be put on a manual toggle switch. Best case scenario is to run a wire from the pcm to the tranny connector and flash the pcm to be an automatic. It can get complicated.
If need a spunky 700 that can take what you are going to be doing with it let me know. We can fix you up!
g
If need a spunky 700 that can take what you are going to be doing with it let me know. We can fix you up!
g
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01-11-2008, 09:19 PM
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this might be a little off topic, but doesnt the 700r4 connect differently to the engine than the 4l60e? I've heard you have to use either a special torque converter or an adapter with a special flexplate. any one know for sure? and the costs associated with the two options?
01-11-2008, 09:28 PM
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I don't know how well either of those automatics will hold up to any sizeable amount of power. Some GTO guys have had 4l60 and 4l65 failures with relatively minor mods (50hp+) over stock. Some of this could be due to extra weight, but it has made me a bit weary of it when considering any future mods. A good converter, shift kit, and properly tuned line pressures can go a long way to prevent this though. I assume you're planning on going with an upgraded converter. How high of a stall would you be considering?
01-11-2008, 09:58 PM
#14
this might be a little off topic, but doesnt the 700r4 connect differently to the engine than the 4l60e? I've heard you have to use either a special torque converter or an adapter with a special flexplate. any one know for sure? and the costs associated with the two options?
Here is a current example.... Our converter shop built us a maximum stall (2500 RPM) stock sized unit for a '91 Vette we are installing behind a LS1 engine. We build an early LT style unit for it because we needed to retain the original 4 bolt tailhousing and output shaft / speedo setup.
The converter needed to have LT splines and a LS crankshaft pilot hub. We used the large core because it is a cruiser and we wanted to give the converter clutch every opportunity to survive long term in this car. No worries. Had it built in a matter of hours and delivered the same day... today! Customers cost??? $350.00.
g
Last edited by Gilbert@Ace Racing; 01-11-2008 at 10:06 PM.
01-11-2008, 10:05 PM
#15
I don't know how well either of those automatics will hold up to any sizeable amount of power. Some GTO guys have had 4l60 and 4l65 failures with relatively minor mods (50hp+) over stock. Some of this could be due to extra weight, but it has made me a bit weary of it when considering any future mods. A good converter, shift kit, and properly tuned line pressures can go a long way to prevent this though. I assume you're planning on going with an upgraded converter. How high of a stall would you be considering?
That is a valid concern. The GTO's can be abusive on these units because of their weight.
They can be built to handle those cars. But, the trannies need to be handled by seasoned High Performance Builders. Most local guys who can add parts have never taken the time to understand what it takes to make on of those units live in a well endowed heavy car. That being said... trucks aren't much different.
And what would you say if I told you a very good friend runs a 427 bbc, read lotsa torque, in front of his well built 700..... in a heavy *** '56 Bel Air. He runs mid to high 7's 1/8 mile.
Point is, getting one of these units to live is all in how the unit and the tune are handled!
g
01-11-2008, 10:06 PM
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That is a valid concern. The GTO's can be abusive on these units because of their weight.
They can be built to handle those cars. But, the trannies need to be handled by seasoned High Performance Builders. Most local guys who can add parts have never taken the time to understand what it takes to make on of those units live in a well endowed heavy car. That being said... trucks aren't much different.
And what would you say if I told you a very good friend runs a 427 bbc, read lotsa torque, in front of his well built 700..... in a heavy *** '56 Bel Air. He runs mid to high 7's 1/8 mile.
Point is, getting one of these units to live is all in how the unit and the tune are handled!
g
They can be built to handle those cars. But, the trannies need to be handled by seasoned High Performance Builders. Most local guys who can add parts have never taken the time to understand what it takes to make on of those units live in a well endowed heavy car. That being said... trucks aren't much different.
And what would you say if I told you a very good friend runs a 427 bbc, read lotsa torque, in front of his well built 700..... in a heavy *** '56 Bel Air. He runs mid to high 7's 1/8 mile.
Point is, getting one of these units to live is all in how the unit and the tune are handled!
g
I'll be there dude!
01-12-2008, 10:27 AM
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so what are yall trying to tell me not to go with a 700r4 if i knew how to make a 4l60e work in my car i would but i dont know how so i bought a 700r4 now yall are telling me that it wont hold up and it will lock up this is not good