4600rpm 1rst, 5000-5100 2nd, 4600 3rd.

tnsyty

tnsyty

Active member
Ok, I put the new governor in with the stiffest springs and heaviest weights and that is what I got. I really want 4800 on all shifts. What do I need to do, try to go lighter spring, Or do I have to drop the weight and leave the stiff springs. The 2nd shif tis about where I want it, 1rst and 3rd need to be bumped up a tad. Thanks.
 
George Blake

George Blake

DONATING MEMBER
Re: 4600rpm 1rst, 5000-5100 2nd, 4600 3rd.

1-2 shift is at 4600
2-3 shift is at 5000-5100
3-4 shift is at 4600

To get the 1-2 shift higher, grind a tad off the weight and try it again. Just do the weight until you get the 1-2 shift right and see how it affected the other shifts. You can then adjust how far the shifts are spread out with the springs.

Here's some instructions. All the kits are the same.


TCI® 326500

Transmission Shift Point Adjustment Kit

TH-350, TH-400, and TH-700R4
​
Thank you for selecting TCI®’s TH-350, TH-400 and TH-700R4 Shift Point Adjustment Kit. This kit will allow you to custom tailor your transmission shift points. This kit gives you all the necessary hardware to make the modifications and adjustments to the transmission governor. Proper installation of this kit can greatly improve peak performance and driveability of your vehicle. This kit will allow you to raise or lower your transmission’s shift points.

This Kit Contains:
One (1) TH-350/700R4 Governor Cover — 0-Ring
One (1) TH-400 Governor Cover Gasket
Two (2) Axles
Eight (8) E-Clips (3/32")
Six (6) Weights
Six (6) Springs

Earlier Shifts…………………………………………® Later Shifts Heavy 1—-2-—3—-4—5—6 Light

Low RPM Quick Shifts……….. ……® Shift Points Spread Apart Heavy Purple - Blue- Green - Yellow - Orange - Red Light



Necessary Tools Needed for Modification (Not Included):
One (1) Drain Pan
One (1) Funnel
Two (2) Quarts of RTF or other Automatic Transmission Fluid
One (1) 1/2" Open-End Wrench (TH400 Transmission Only)
One (1) Small Flat Blade Screwdriver
One (1) Small Punch
One (1) Diagonal Cutters
One (1) Torque Wrench

NOTE: A clean work area is a must — Dirt is one of the #1 causes for transmission problems. This kit is not intended for use in transmission in poor operating condition.

Because TCI®’s TH-350, TH-400 and TH-700R4 Shift Point Adjustment Kit contains several shift point combinations it is important for you to record certain data. First, record your vehicle’s performance before you make any modifications. Use a legal pad or notebook to keep up with this information. Record the engine speed (RPM) and/or vehicle speed (MPH) at which point your transmission shifts. You should record each combination (spring/weight) change to the governor so you can easily select the combination that YOU WANT. You have several combinations available.

If you have driven the vehicle — you must allow time for the transmission to cool before beginning installation. You will need to raise your vehicle 1-2 feet — give yourself room to work. Use wheel ramps or jack stands in good condition to support your vehicle. (SAFETY)

STEP 1: TH400 Transmissions: Remove the four (4) 1/2" bolts that hold the governor cover in place. The governor assembly can be removed by pulling out and turning 1/8 of a turn counterclockwise.

TH350 and 700R4 Transmissions: Remove the clip holding the governor assembly.

STEP 2: With a pair of diagonal cutters cut the heads off the stock axles and discard. (Your TCI® kit contains new axles.) Select a weight and spring combination. If you have recorded your stock transmission data you will know if you would like an earlier or later shift point. Start your selection by going one step heavier or lighter. Heavier weights produce earlier shifts, lighter weights produce later shifts. Stiffer springs produce quick-close shifts, weaker springs spread the shift points apart. (The weights will bring your shift points into the general range and the springs will fine tune the shift points.) Do your change one at a time and record all data... Remember you are working for the ultimate combination for YOUR vehicle. This can only be accomplished through trial and error. It is possible to raise your shift points higher by using a single inner weight and spring but you must always use the outer weights.

STEP 3: After you have selected the inner weights place them inside the heavy outer weights. Install the spring from your kit on the raised spring perches. Install one of the E-clips on each of the TCI® axles. (Make sure the E-clips fit into the grooves on the axles.) Install the weight and spring assembly onto the governor. Place the cover on the governor. Insert axle through the cover, governor body and the weights. Install a second E-clip on each axle. (An extra set of 3/32" E-Clips are provided in your kit.) Make sure the governor valve moves freely in its bore and weights move freely.

STEP 4: Install the governor assembly into the transmission. A gasket is supplied for TH-400 governor cover and an 0-ring is supplied for TH-350 and TH-700R4 transmissions. Tighten TH-400 governor cover bolts to 15 foot pounds. TH-350 and TH-700R4 Transmissions: Replace clip over cover on transmission. Make sure clip is secure and cover is seated to prevent leaks.

STEP 5: After installation - start engine and allow vehicle to warm up. Check automatic transmission fluid level. If needed add TCI® RTF or any quality ATF until the fluid level on the dip stick is between the add and full marks. DO NOT OVERFILL TRANSMISSION.

STEP 6: Lower vehicle and test drive. Record all shift information on your data pad. If your shift points are too early use a lighter spring/weight. If they are too late, use a heavier spring/ weight. You will need to repeat steps 1-5 until you have achieved the shift points that will give you the maximum performance from your vehicle.

 
tnsyty

tnsyty

Active member
Re: 4600rpm 1rst, 5000-5100 2nd, 4600 3rd.

I think my truck is posessed! OK, I went back to weights #1 and #2. I changed to the blue and yellow springs, now my truck shifts around 5400. Again, I am afraid to stay completely into it, as it may not actually shift. I am going to pull it out, again, and go back to the purple and a green springs. That is as close to my origional I can get. Remember, my first attempt was 4600,5000,4600. AGHHHHHH. Also, why does my TACH jump all over the place after it pulls past the orange area? it will jump 5200-6000 like the guage is messed up. I figure it just doesn't like being reved that high or this gauge is about as acurate as the stock boost guage when reved out of its rpm range.
 
tnsyty

tnsyty

Active member
Re: 4600rpm 1rst, 5000-5100 2nd, 4600 3rd.

dgoodhue said:
The tach jump is an ignition issue.
Click to expand...

Yeah, I may get a new distributor soon anyhow. It is the OE piece. I am fixing to crawl back under the truck. I am out of things to try. SO, I am just goign to put the heavy springs back in and learn to live with an early shift in 1rst. (4600)
 
George Blake

George Blake

DONATING MEMBER
Re: 4600rpm 1rst, 5000-5100 2nd, 4600 3rd.

You need to run a datamaster before you blow your engine up. Your checking WOT runs, your tach is bouncing all over, and your reving it higher than normal. It's most likely detonating if the tach is bouncing.
 
tnsyty

tnsyty

Active member
Re: 4600rpm 1rst, 5000-5100 2nd, 4600 3rd.

The ultimate was showing only a touch or knock on the LED at the 2nd gear shift and only on occasion. I think something is screwed now though. On my last run i noticed the rpm's were going down from 48-3800 at 80mph, but there should not even be a shift there. I am thinking it is my TCC lockup maybe? I pulled it down into 3rd for some runs and at almost redline the trans just let go and the engine hit the fuel cut at about 6k. WTF. I did a roll with it pulled into 3rd from about 85-95 and bam it did it again. It still pulls great in all the gears including 3rd until it gets near the red. I have been running great all last night and today with almost no knock on the ultimate, and now, I have noticed that it is going back to the way it was where it hits severe knock in 3rd. Ahhh, I am going to let everything cool down and see if I can dig out the DIACOM.

I hate this truck!
 
tnsyty

tnsyty

Active member
Re: 4600rpm 1rst, 5000-5100 2nd, 4600 3rd.

Okay, DIACOM runs revelaed many problems. 1 my tach is inaccurate, diacom shows 4750 as my max rpm the whole way, tach was showing mid 5500. I cannot even see where it is changing gears, that rpm's never fall. Knock is in teh 6-7 range, but I think my IC pump just died, so I am pretty sure that is a big part of it. MAT is 214!!! O2 is 872-890mv. So my shifts are not where I thought they were.

2nd run was with the tcc switch on. 1rst gear i see eh shift at 34mph 4025rpm 5KR, 2nd 4850rpm 4kr, 64mph, 3rd, i started to get KR so I shut down as always. MAT was betwenn 206-253!!!! O2 880's
 
tnsyty

tnsyty

Active member
Re: 4600rpm 1rst, 5000-5100 2nd, 4600 3rd.

Back from the dead. Just did a tune up at JKsyclone's house. We still did not put the prop shaft in. I want to get the shifts right first. I went out and did some runs at 6psi to get a feel for the shifts. Here is my current shift RPM:

1>2 4200-4300
2>3 4900-5000
3>4 4300-4400

I am still running the heaviest weight and spring combo. I read that lighter springs will spread out the shifts, which would be bad on my 2>3 shift. I also read that lighter springs will bring the 2>3 shift closer to the 1>2 shift. I am getting close. It is really getting closer to being right. Just a little late on the 2nd shift and a little quick on the first shift, and 3rd shifts. I want to lighten the weights a little, but it is going to affect the 2nd shift too much. At least all of my shifts are crisp!
 
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