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#21
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Quote:
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#22
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How are you getting the TH350 to shift at 5K+ rpm?
Is there a specific adjustable vacuum modulator that will set up that high...or do you shift manually? It seems too easy to miss a shift, or push it into neutral if shifted manually. |
#23
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Most GM 350 and 400 auto's are set to shift no higher then 4800, to go higher the governor needs to changed or moded.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#24
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governor controls WOT shifts, not modulator. they sell kits to adjust governor shift points.
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#25
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My 455 + .030 and #16 heads (250cfm/185) solid cam, Offy intake liked 5,500rpm but that was a track car. The 68 GTO 455 with 7f6 and 041 cam like 5000-5200rpm
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The Following User Says Thank You to straycat For This Useful Post: | ||
#26
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"How are you getting the TH350 to shift at 5K+ rpm?"
One way....... Valve Bodies http://www.hughesperformance.com/valve-bodies/ .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#27
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Quote:
Trans Go makes great kits. Myself, I run a trans brake. |
#28
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Many use an aftermarket shifter that helps.
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#29
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How does a hydraulic Trans EVER Known the Engine RPM ? Ask the Governor
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#30
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Automatic?
TH400, shift to 2nd manually at redline then slide it into D and let the tranny have it. If you can get to the strip, try different fairly low launch rpms, shift methods, and shift points and let your time slips be the guide.
The secret is only change one thing at a time and make notes. As an example, launch without increasing RPM. Then increase launch RPM in increments until you're 60 ft time stays the same. Finally use the next to the last RPM to launch. Hope this helps. |
#31
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+.030 455SD. Stock as cast SD heads,stock lift,duration cam,stock pistons,stock lifters,stock pushrods,stock valves, stock springs, stock ignition. I've tried different shift points. Seems to like 5400. 12teens 110 best at 3700 lb car weight.ive tried 4.56,4.10 and 3.73 gears. I couldnt get the 4.56s to work to violent with 9×30 slicks. I'm just a backyard guy learning as I go.
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The Following User Says Thank You to sdbob For This Useful Post: | ||
#32
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Wow you got a super duty too. The car that performed best with the shift method I described was a 1970 ram Air 3 all cast iron. Cam was a little warmed up but not so much as to cause power braking issues. It pulled 15 in of vacuum which is what you should be getting. It had a turbo 400 and a 355 gear.
Yeah I wouldn't go too nuts with the gear. I found that a 390 gear gives about red line in a quarter. I would recommend a 355 or 373 if you're going to drive it on the street. Doesn't sound like that's the case. |
#33
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Well found block many years ago completely by chance in a junkyard. I could not believe it either for $35.00,rods,pistons and distributor. Put engine in a junk 2nd gen. John Herslow recommended the 4.56 gears. He was NHRA record holder in E/SA.
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The Following User Says Thank You to sdbob For This Useful Post: | ||
#34
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RAIV heads on 455 stock rods 6200.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#35
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What was your RPM at the quarter mile with the 456 gear?
Sent from my T767W using Tapatalk |
#36
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The stock 455 with 6X heads I took out of my 62 Catalina was done making power at 4800 RPM. Shifted it around there. It had a 65 Tri-power on it and I think an 067 cam. Decent torque idle to 3000 RPM. I was happy to replace it.
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#37
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That was 1980s. I would launch, 2nd would come as quick as I could shift( probably tire slip),then 3rd. I would keep rpms below 6200. I believe he was saying the 56s would get the car moving quicker. It was violent I'll say that.
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#38
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I tweaked the governor in my TH350 to shift at 600 with a B&M kit.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#39
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my current car i have never tracked. but i shift it at 4800 cause it does'nt pull hard past that. i did track a 400 in the 80's with 3.08 rear and it was at the 6000 rpm that it stopped pulling at in 3rd at end of 1/4. a swap to 3.73 put me into 4th, but i dont remember rpms at end of 1/4.
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