Change in power after Transmission and rear changes - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 32 (permalink) Old Jul 1st, 19, 7:30 AM Thread Starter
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John
 
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Change in power after Transmission and rear changes

I am noticing that after the change from TH350 to 2004-r with 3.08 I used to be able to spin the tires from rolling position and start, changed the transmission and unable to spin the tires, changed rear to 12 bolt 4.33 from 10 Bolt 3.08 still unable to spin tires unless I power brake it and not from rolling position, I feel slip at times in transmission which was rebuilt last year and sat in garage until 2 months ago
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post #2 of 32 (permalink) Old Jul 1st, 19, 11:27 AM
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Re: Change in power after Transmission and rear changes

What torque converter?
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post #3 of 32 (permalink) Old Jul 1st, 19, 12:34 PM
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Re: Change in power after Transmission and rear changes

That does not make sense. If you could spin the tires with the 3.08 gears you should easily be able to with the 4.33's Plus the 200 has a slightly lower first gear ratio. Are you absolutely certain the rear is 4.33 ??

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post #4 of 32 (permalink) Old Jul 1st, 19, 12:36 PM Thread Starter
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Re: Change in power after Transmission and rear changes

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What torque converter?

I am going to Transmission place today and ask that
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post #5 of 32 (permalink) Old Jul 1st, 19, 12:38 PM Thread Starter
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Re: Change in power after Transmission and rear changes

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That does not make sense. If you could spin the tires with the 3.08 gears you should easily be able to with the 4.33's Plus the 200 has a slightly lower first gear ratio. Are you absolutely certain the rear is 4.33 ??
it is a 3 series carrier with a 4 series 4.33 with spacer , I Called Richmond when I got it and gave them the numbers on the gear and they told me it was 4.33 I asked are you sure and they said yes
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post #6 of 32 (permalink) Old Jul 1st, 19, 1:37 PM Thread Starter
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Re: Change in power after Transmission and rear changes

just came from transmission garage, he is checking and will call me later, this started after changing to the 2004-r even with the 3.08
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post #7 of 32 (permalink) Old Jul 1st, 19, 2:15 PM
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Re: Change in power after Transmission and rear changes

Maybe the transmission is not going into low gear? Did you change the shifter detents to accommodate the new transmission?
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post #8 of 32 (permalink) Old Jul 3rd, 19, 11:16 AM Thread Starter
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Re: Change in power after Transmission and rear changes

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Maybe the transmission is not going into low gear? Did you change the shifter detents to accommodate the new transmission?
do you mean from the column shift rod for the th350 to 2004-r? I Installed a new lokar Shifter rod kit, also took it to the Transmission place that rebuilt the tranny, and they test drove and supposedly checked that before I changed the rear.
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post #9 of 32 (permalink) Old Jul 3rd, 19, 12:24 PM
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Re: Change in power after Transmission and rear changes

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Originally Posted by Bradco View Post
do you mean from the column shift rod for the th350 to 2004-r? I Installed a new lokar Shifter rod kit, also took it to the Transmission place that rebuilt the tranny, and they test drove and supposedly checked that before I changed the rear.

Brad,
When you drive the car how many times does it shift ?

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post #10 of 32 (permalink) Old Jul 3rd, 19, 1:36 PM Thread Starter
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From stop I think I feel 3, but will take it out after work today and verify. I do feel it drop down around 35 to 40 I have lock up solenoid external with 12 volts, Also I see floor shifters with d with circle around it then d the first one is where I should be correct. I have column shifter
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post #11 of 32 (permalink) Old Jul 3rd, 19, 6:17 PM Thread Starter
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Quote:
Originally Posted by BillK View Post
Quote:
Originally Posted by Bradco View Post
do you mean from the column shift rod for the th350 to 2004-r? I Installed a new lokar Shifter rod kit, also took it to the Transmission place that rebuilt the tranny, and they test drove and supposedly checked that before I changed the rear.

Brad,
When you drive the car how many times does it shift ?
Yes from stop it changes 3 times on the street last change close to 40mph
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post #12 of 32 (permalink) Old Jul 3rd, 19, 8:53 PM
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Re: Change in power after Transmission and rear changes

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Originally Posted by Bradco View Post
Yes from stop it changes 3 times on the street last change close to 40mph

That sounds like it is using all four gears so it is going into first. No idea, does not make sense. Do you have a tach ? If so what rpm at 50 mph ? What size rear tires ?

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post #13 of 32 (permalink) Old Jul 3rd, 19, 9:17 PM Thread Starter
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The 3rd change meant at 40. Have 28” tires not sure my rpm tach is right as around 60 I am less than 2000 rpm and have 4.33 gears
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post #14 of 32 (permalink) Old Jul 3rd, 19, 9:21 PM
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Re: Change in power after Transmission and rear changes

What stall speed is the converter?

Maybe the th350 had a higher stall converter which would let you get the engine into the power band when you romped on it, and the 2004r may have a lower (stock?) converter which won't wind up into your power band until you are well under way?

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post #15 of 32 (permalink) Old Jul 3rd, 19, 10:24 PM
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Re: Change in power after Transmission and rear changes

Quote:
Originally Posted by Bradco View Post
The 3rd change meant at 40. Have 28Ē tires not sure my rpm tach is right as around 60 I am less than 2000 rpm and have 4.33 gears

That is pretty close. I came up with almost 2100 rpm at 60 with your 4.33 gear and a 28" tire.



Is there any chance that something else got moved while doing the trans ? Distributor maybe and timing changed ? Another maybe stupid question but are you getting wide open throttle on the carb when you push the pedal to the floor ?



I cant think of anything else.
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