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Any ill effects to my 700r4?

gone huntin

gone huntin

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From driving around in drive instead of overdrive? My entire drive to work is under 45mph and since I put the 35's on it lugs alot in "OD". I'm running 4:10 gears and really don't want to regear right now. I might go back to 33's later. I there a maximum safe speed for the tranny in drive?
 
I say you aren't hurting anything, way better than cooking it in OD w/ wrong tires/gears.

I think the max safe speed is the max safe rev of the motor in D, whatever that happens to be.
 
You wont hurt a thing running in drive. It is better for your 700 to run in drive at slower speeds or towing.
As said, running too low of RPMs in OD is really bad for 700r4s. General rule of thumb is cruise down the freeway should not be less than 1800- 1900 RPM in OD.
I usually run around town and speeds under 50 in D
 
Definately better on the trans to be in Drive at those speeds.

Also if you are going to be changing speeds often even at high speeds. It is easier on the 700 not to be shifting in and out of overdrive. On our work vehicles we were advised to avoid overdrive if changing speeds or driving less than 55 mph.

FYI it was pretty normal for our work vehicles to run at high speeds:D
 
ya, i like to keep mine in 3rd and not OD because the lower the rpms, the less fluid moving, less pressure, and OD is the last to get fluid, so im guessing the clutches wouldnt be too happy with u after while, im 98% sure thats how things work,correct me if im wrong...:crazy:
 
The owner's manual that came with my '83 Chevy van with an early OD said to tow or drive in "D" at lower speeds to reduce the number of times the trans had to shift in and out of overdrive.
 
One thing you may want to do is determine if you get lockup in 3rd. Some 700's are set up this way originally, some aren't.

If you aren't set up for it, you may want to consider modifying it to do so. It'll save ya gas and keeps the internals cooler.
 
Yes, mine has lockup in drive. Thanks for the replies guys, I was worried about the prolonged higher rpms on the planetary.
 
Thats how Ive ran all my 700s. OD only sees daylight on the highway. Heck my Blazer I even run that way. Course the tranny is weak enough in that thing Im more or less just puting a bandaid on a bullet wound.
 
I only use OD on the highway, like 50 plus, or long distances with out stops.
 
On the subject of a 700 with 35 tires, what are good gears to put in. I have 4.10 too and need to change them out. Will 4.56 be deep enough or do I need 4.88???? No hard core stuff, just trail stuff and pastures.
 
JPMSK5 said:
On the subject of a 700 with 35 tires, what are good gears to put in. I have 4.10 too and need to change them out. Will 4.56 be deep enough or do I need 4.88???? No hard core stuff, just trail stuff and pastures.
Click to expand...

4.56 would be pretty close to stock, 4.88 would have that extra "oomph"
 
were do yal buy your gears and master install kits today? I do pull alot of trailers with it, but I think the 4.56 with the ability to lock the TC in drive will work ok. anybody know where to get a good kit for the TC control?
 
All torque converters use fluid moving over a set of blades to make the transmission spin. There are losses associated with this, due to friction and mechanical inefficiencies - so the torque converter will spin faster than the input shaft going into the transmission (slippage). Lockup torque converters have a clutch added to them. Under certain conditions (usually cruise) this clutch is "locked up" to that input shaft I mentioned earlier, so there is no slippage at all. It's like having the clutch engaged on a manual transmission. Benefits are better mileage and no extra heat production.

Here's a couple sites that cover this stuff in-depth. :thumb:

http://www.700r4.com/faq/faq.shtml

http://auto.howstuffworks.com/automatic-transmission.htm
 
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