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Power loss

Muddytazz

Muddytazz

1 ton status
Joined
Jun 30, 2002
Posts
20,072
Reaction score
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Location
Salem, Or.
Ok, here's my stats:

350 (roughly 80k)
Th350 (rebuilt last yr)
203 (full time)
D44 (open w/4.10's)
14FF (gov-loc w/4.10's)
33 x 12.5 x 15's

Last year when I swapped out my 1/2ton axle that had 3.08's, I was running the same 33" tires. After I swapped in the 3/4ton axles with the 4.10's I was expecting a big power gain. I never really thought about it until now tho. With the 3/4ton and 4.10's it STILL feels like I'm running with the 3.08's. Any ideas what could be up /forums/images/graemlins/dunno.gif
 
I don't think so, it still did it after i had the tranny rebuilt in sept of 2003.
 
Only reason I ask that is its possible to have power loss from a problematic transmission or torque converter.

You said it did it before and after the tranny was rebuilt?

Before and after the gear swap as well?

Did you feel any difference with the new gearset?
 
I was still running the old tranny after the gear swap, had the tranny rebuilt about 8 months after the gear swap. When I did the gear swap, I did feel a power gain as expected from swapping gears, just doesn't feel like I'm getting what it should be. Could it be because of the 203 still being full time?
 
Tim, I have no idea. Like I said, the motor has about 80k - 100k on it, its due for a rebuild. I have a SB400 thats going to be going in next spring /forums/images/graemlins/thumb.gif
 
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I was still running the old tranny after the gear swap, had the tranny rebuilt about 8 months after the gear swap. When I did the gear swap, I did feel a power gain as expected from swapping gears, just doesn't feel like I'm getting what it should be. Could it be because of the 203 still being full time?

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3.09 to 4.10 isn't a HUGE gain. It's not going to be a huge difference in power. What are you using as a comparison to gauge your results?
 
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I was still running the old tranny after the gear swap, had the tranny rebuilt about 8 months after the gear swap. When I did the gear swap, I did feel a power gain as expected from swapping gears, just doesn't feel like I'm getting what it should be. Could it be because of the 203 still being full time?

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3.09 to 4.10 isn't a HUGE gain. It's not going to be a huge difference in power. What are you using as a comparison to gauge your results?

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What really got me thinking about it again was when I was up on the mountain for hunting season. There is a 3 - 5 mile stretch of 6% grade that I have to climb. When I was 3.08's and 33's I had the throttle floored with an empty burb and top speed was maybe 30 mph, this yr when I went with the 4.10's and 33's with same conditions, my top speed up the mountain was like 35 or 40 mph.
 
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Check your vacuum advance. It could be frozen like mine was.

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Check your mechanical advance also. My weights were rusted to the shaft and the distributor wouldn't advance at all.
 
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Check your vacuum advance. It could be frozen like mine was.

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Check your mechanical advance also. My weights were rusted to the shaft and the distributor wouldn't advance at all.

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Thats what I was referring to. The vacuum advance engages the mechanical advance innards. If they are frozen, you get no advance. Just like I wasn't.
 
could also be you weren't jetted well for altitude. i remember swaping 3.08s to 4.10s with an axle swap like you did and didn't really notice much change either. just a bit better off the line.

i used to have a k5 with a sb400 and 3.42s and 35s. when the motor started to knock i but in a used 350 that was less then a year old on a rebuild and i noticed a big drop in torque from my tired 400. so you should be super happy when you get your 400 in. i think they are awesome truck engines.
 
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