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Soo... 4.10 gears are in. No Overdrive. =/

I run the exact same setup. 350, 400, 4.10s, 35s and it's like the perfect setup. It shifts like it was stock with no gear hunting and it runs in OD all the time on the highway.
 
CherryK5 said:
Well at 60 mph its at about 3200rpm. but its in third not OD. And there's no binding or anything. And no front drive shaft until i get the gears put in the front.

And its a 700r4 and a 14bff with 4.10's and 35's
Click to expand...

just because there is no front shaft doesn't mean the t case didnt get bumped into low side did you have someone look at the front output on the t case while idling around in drive?
 
sooperedd said:
I run the exact same setup. 350, 400, 4.10s, 35s and it's like the perfect setup. It shifts like it was stock with no gear hunting and it runs in OD all the time on the highway.
Click to expand...

400 doesn't have OD :dunno:

Black Betty's Daddy said:
just because there is no front shaft doesn't mean the t case didnt get bumped into low side did you have someone look at the front output on the t case while idling around in drive?
Click to expand...

Im not sure you could make it to 60 in 4L with 4.11's and 35's and still be at 3200 RPM :eek1:
 
alright so enough with the 4lo and tv cable stuff.
it's in 2WD and the TV cable is set right. I can promise you that
and I went on a drive a second ago and it's at about 2600 to 2800 rpm at 65mph

What I need to know is what would make the transmission not shift to overdrive?
 
What I need to know is what would make the transmission not shift to overdrive?
Click to expand...

Sumthang is broke.....


Sorry, I got nothing. Just the usual suspects. Linkage, governor, etc.
Does the computer have any control over the OD?

This is really a long shot, but when I get called in cold to fix something, one of the first things I ask is has anything been done recently to the system.

I assume that OD worked before the gear change.
Not much you can do to the rear end that will affect it, but taking the shaft loose, and working under there in general, maybe something got bent or a wire torn loose??
 
bad 3/4 clutch........ is it shifting ok at 1/2 and 2/3?

are you 100% sure the actual shifter is in OD? can you feel the detents for each position? column shifters bring the suck...
 
From my Transmission Manual for the 4l60 (700r4).
Symptom: No 3-4 Shift/Slipping or Rough 3-4 Shift.

Possible Causes:
Governor
Governor weights binding
Governor Valve Stuck
Governor driven gear retaining pin missing or loose
Governor driven gear damaged
Governor support pin in case too long or too short.
Oil Pump Assembly
Faces not flat
Pump Cover retainer and ball assembly omitted or damaged
Valve Body Assembly
Valves Stuck
2-3 Shift valve train
Accumulator Valve
Throttle Valve
T.V. Limit Valve
1-2 Shift Valve Train
3-2 Control Valve
Manual Valve Link Bent
2-4 Servo Assembly
Missing or damaged seals

There are more but I got tired of typing them, they arent very likely anyway and mostly have to do with incorrect assembly.

I would consider the throttle valve, 2-4 Servo, and governor problems most likely. it does not take much to stick the throttle valve and it will cause a host of shift problems.
 
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driney said:
I think it's going to fix itself.:haha:
Click to expand...

Bahaha. Yea it's a little inconsistent. I think it's because I'm using the gps as a speedo.

Edit:i still read that and think "wow that makes me sound like a complete moron"
 
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ryoken said:
bad 3/4 clutch........ is it shifting ok at 1/2 and 2/3?

are you 100% sure the actual shifter is in OD? can you feel the detents for each position? column shifters bring the suck...
Click to expand...

woah Ryoken. It's an honor.

But yea the 1-2 and 2-3 are fine. 1-2 almost feels like I have a shift kit sometimes but it still shifts between 1500 and 2000 rpm unless i've got the petal mashed.
could it maybe be the TC lockup? Or does the transmission actually shift to a taller gear?
if it's the TC lockup that's an easy fix.
 
OD is a taller gear. The TC lockup is a separate issue, it just takes the slip out of the torque converter. I'm not sure, but I doubt the TC lockup affects RPM's by more than 200.
 
I don't know if we can trust any of your numbers. Are you sure the tach works right? Are you holding a speed long enough for the GPS to get a good measurement?

To get into 4th gear, the transmission just applies the 2-4 band, which is the same way it shifted into 2nd gear. So if the other shifts are OK and the only problem is that is won't go into 4th, it must be a stuck valve or a bad seal (possibly on the 4th apply piston).

The hardest shift for a 700 is the 2-3 shift, so if it does that OK, there is a lot that is *right* with it (the band, the forward clutch, the 3-4 clutch, the 2nd apply piston, etc., etc).

But I'm not sure you're done defining the symptoms.
 
Blue85 said:
I don't know if we can trust any of your numbers. Are you sure the tach works right? Are you holding a speed long enough for the GPS to get a good measurement?

To get into 4th gear, the transmission just applies the 2-4 band, which is the same way it shifted into 2nd gear. So if the other shifts are OK and the only problem is that is won't go into 4th, it must be a stuck valve or a bad seal (possibly on the 4th apply piston).

The hardest shift for a 700 is the 2-3 shift, so if it does that OK, there is a lot that is *right* with it (the band, the forward clutch, the 3-4 clutch, the 2nd apply piston, etc., etc).

But I'm not sure you're done defining the symptoms.
Click to expand...

The last one was a steady 65 on a flat road, uphill it gets up to 3000 so it varies a lot depending on the incline.

And the 50mph thing was an exaggeration.
And i was scared driving steady over 2100rpm(remember i had 2.73 so 70mph was around 2200)

But im getting used to it now, but i still want to diagnose the problem.
Is there anything outside of the transmission that could be the culprit?

And i realized earlier that when i completely let off the gas it shifts to OD ( i think) because the rpm's drop down to idle and when i hit the gas again, even a little, it has a pause before it shifts back down and the rpm's catch up. But if i shift it to third and let off the gas it has an engine brake effect.
 
CherryK5 said:
Bahaha, yea im sure.

Things im sure of:
-It's in 2wd
-It's in 3rd
-It's a 700r4
-It's 4.10 gears
-My TV cable is set right.
-I want a th400
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then for the time being, just leave the trans in 3rd gear :D if i remember right, the torque convertor still locks up at speed in 3rd as well. Thinkin i heard that somewhere, or felt it in mine, could be wrong though, i'm sure 4x4high will correct me :D:laugh:
 
4xcrazy , you are correct sir ,unless it has been eliminated the TC will lockup in 3rd under the right load and speed

If it was me, Id pull the servo and check her out before tearing into the valve body
 
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