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01-08-2008 #1
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- Aug 2005
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Switch Pitch TH400...who is running one??
I am considering converting my current fixed pitch TH400 over to variable pitch in the near future. I have talked with both PAE and TSP about them. Would love to here some feedback on them from you guys. Most of the buick guys I talked to seemed to like them.
The car it would be going in is my 69 Camaro with a 408sbc. I am currently running a 3500 stall with a GV and I would really love to tighten up the converter for around town and long highway trips.
Thanks guys!
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01-12-2008 #2
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- Oct 2004
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- Niceville, Florida 32578
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Quite a few Pontiac folks use them. Try the link for some good responses.
http://forums.performanceyears.com/forums/index.phpAll that is necessary for evil to succeed is that good men do nothing.
Edmund Burke
01-19-2008 #3
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- Jul 2005
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- Miami, Florida
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- 168
I have been looking at the same option as you. 4l80e is to expensive in the 3k range but for around 1k I can do a variable pitch to my already heavy duty tb400 have the stall that I like and get a lock up for the highway.
I would like to know what my highway speed will be with a final 1.1 locked up with a 26 inch tire at 70 mph. is there a calculator any were in the net.?
01-19-2008 #4
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- Jul 2005
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- Miami, Florida
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Wao. found a calculator at www.f-body.org/gears/ you can put all your info and it will tell you how fast at what rpm od is better for sure.
01-19-2008 #5
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- Mar 2006
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- OC CA
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- 470
70 MPH !!
Originally Posted by 540' chevelle
Ok, here ya' go: 1:1 final drive at trans.
MPH= (RPM X tire diameter) > (gear ratio x 336)
RPM= (MPH x gear ratio x 336) > tire diameter
Rear end gear ratio = (RPM x tire diameter) > (MPH x 336)Mark
LS1- T56
under construction
"Political Correctness is a doctrine, fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."
01-19-2008 #6
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- Aug 2005
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- stockton,ca
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- 246
Well...I ended up skipping on the switch pitch. Ended up going with a Continental "tight" 10" fixed pitch converter. They said it will be very tight at cruise but will flash 2800-3000 at WOT.
69 Camaro
491BBC/TH400/GV OD/9"
01-25-2008 #7
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- Sep 2006
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- Southern Indiana
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- 4,709
Well I bought a core trans back in 86 after hearing about them but havent done anything with it yet.
01-25-2008 #8
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- Sep 2006
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- Southern Indiana
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Heck with the DV over under you should be good to go. Remember you wouldnt have to completely change trans just front pump forward cluch/input and valve body from what my old tranny instructor told me. I keep thionking Ill get the input shaft pressed out of the one I have and wap on the 6 disc caddy clutch drum and swap in the front pump but havent got a converter nor cash so it sits in mom garage for now.
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