T350 shift point - Team Camaro Tech
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Transmission & Driveline Transmissions and Differentials

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  #1  
Old Feb 23rd, 13, 09:12 PM
PA Camaro Guy PA Camaro Guy is offline
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Brian
 
Join Date: Apr 2008
Location: PA
Posts: 603
Default T350 shift point

I'd like to move my first gear shift point up. Under medium throttle my transmission seems to want to ditch first gear too early. I'd guess somewhere between 2000-2500 max. This is a street car, so ideally what I'm looking for:

1)Light load driving (using only the primaries) let it shift low... goal is to get to third as quickly as possible for cruising/comfort. Seems to be doing this just fine but at the sacrifice of scenario #2 which is more how the car is driven...

2)Medium load (secondaries active) hold 1st to about 3000, which should equate to about 26 mph on 3.73 gears in the rear/26'' tires per the calculators

3)WOT let the kick down cable do the job, hold to about 4000 or 34 mph

How do I improve my intermediate load shift point? I have a tunable vacuum modulator but it came with no instructions. I think it has a screw inside the hosebarb fitting on the end that can adjust the transmission but I'm honestly not sure what it will affect or how to do it.

Brian
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1969 Camaro 383
2.02/1.63 & 234/244 Vortec
TH350 / 12 bolt 3.73
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  #2  
Old Feb 24th, 13, 06:42 PM
stea stea is offline
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Shane
 
Join Date: Oct 2011
Location: Utah
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Default Re: T350 shift point

Adjusting the modulator will only change the shift point by maybe 2-3 mph.

Not sure how to adjust mid throttle shift points but on mine I modified the governor with a kit from B&M. So now at full throttle from a stop shift point has moved to 5k rather than 2.5k (or less). Works for me. Nice low rpm shifts when putting around and screaming shift points when wanted.
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  #3  
Old Feb 24th, 13, 10:47 PM
Steptoe Steptoe is offline
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Steps
 
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Location: New Zealand
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Default Re: T350 shift point

There are 2 modulators... an adjustable and non adjustable...the adjustable has a flat blade screw up inside the end...
This can be very sensive, espec on light and meduim loads.....
I cant rem which way... clockwise/ anti clock is which now....so start turning 1 fu;ll turn see what happens....then turn a full turn in the direct u want to go after road test...
then 1/2 turn , then 1/4 then 1/8 and u will be close onto it till...
you come to your long meduim steep hill that u know u should cruise up in top , but the trans keeps changing back and forth... 1/16 turn will do the final fine tune to taylor to YOUR driving style.

When it come to full WOT changing, yes the above does effect the change pionts a little...but to do so correctly, IF the light load/ med load doesnt suit, will have to be done inside the trans...
For the general cruiser, get the light loads right and generally a manual chopp down change for your exteme showing off BS antics lol

Before making any adjustments thu, make sure the kick down is adjusted correct ....
hold throttle WOT and fully pull on the end of the cable... there should be 3/16" gap play.
Also check, after this adjustement that the kick down is sitting into the trans, not caught up on the pipe.
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  #4  
Old Feb 25th, 13, 09:15 AM
PA Camaro Guy PA Camaro Guy is offline
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Brian
 
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Location: PA
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Default Re: T350 shift point

Thanks guys. I'll start with the external and start turning clockwise to see what happens. If I can't get where I want to be that way, then I'll change the internal governor. With a 2600 stall converter, it's silly to be slipping out of 1st get before I even get locked up.

Brian
__________________
1969 Camaro 383
2.02/1.63 & 234/244 Vortec
TH350 / 12 bolt 3.73
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  #5  
Old Feb 25th, 13, 03:01 PM
X-77 keith X-77 keith is offline
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keith
 
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Location: Yorktown Va
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Default Re: T350 shift point

The stock governor can be modified to turn up faster. A good trans shop can do it in about a hour or less.
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  #6  
Old Feb 25th, 13, 03:10 PM
Eric Kammerer Eric Kammerer is offline
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Join Date: May 2004
Location: Southeast PA
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Default Re: T350 shift point

Remind me where in PA you are?
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Eric
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!
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  #7  
Old Feb 25th, 13, 06:23 PM
PA Camaro Guy PA Camaro Guy is offline
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Brian
 
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Location: PA
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Default Re: T350 shift point

I spoke to the shop that rebuilt the tranny for me- they offered to do the inside work to accomplish the task but recommended first starting with the external canister.

Eric- Pittsburgh
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1969 Camaro 383
2.02/1.63 & 234/244 Vortec
TH350 / 12 bolt 3.73
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  #8  
Old Feb 26th, 13, 07:57 AM
Eric Kammerer Eric Kammerer is offline
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Location: Southeast PA
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Default Re: T350 shift point

Ok, then I can't send you to my guy in Carlisle...
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Eric
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!
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  #9  
Old Feb 26th, 13, 12:50 PM
Steptoe Steptoe is offline
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Steps
 
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Location: New Zealand
Posts: 13,029
Default Re: T350 shift point

Quote:
they offered to do the inside work to accomplish the task but recommended first starting with the external canister
.
Excellent advice...and check the kickdown adjustment AND cable into the trans.
Adjust and drive around for a while to get a feel...readjust if need be. If then doesnt come close to what u want go see you workshop guys.
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Team Camaro Tech > First Generation Camaro Info and Tech - 1967- 1969 "Where it all started" > Transmission & Driveline      Current Topic: T350 shift point
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