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Thread: New converter, now trans is weird

Started 1 year, 8 months ago by Yardley
I just put a wicked 3800 stall Coan converter in my Riv. The car is now unreal. It launches so hard! I love it! But... What I really hate is this: when I slow down to a very slow speed in traffic or to make a turn, the trans just won't pull down into 2nd gear. It hangs in 3rd gear, and when I accelerate to get up to traffic speed (like to 35 or 40 MPH) it really winds the motor and the...
Site: V8Buick.com  V8Buick.com - site profile
Forum: The Juice Box  The Juice Box - forum profile
Total authors: 26 authors
Total thread posts: 89 posts
Thread activity: no new posts during last week
Domain info for: v8buick.com

Other posts in this thread:

70aqua_custom replied 1 year, 8 months ago
I am NO expert but I have rebuild a couple of automatic transmissions. Since no real experts are talking yet I got out my book and looked at the THM400 diagnosis chart. The closest problem I could find to what you describe is "No part throttle downshifts" Condition (a) "3-2 valve stuck, spring missing or broken." Correction "Free valve and or replace spring." Condition (b) ...

gsx678 replied 1 year, 8 months ago
Manual valve body works everytime.

Jim Rodgers replied 1 year, 8 months ago
Jeff, Check the rubber line that goes to the modulator valve. It very well could have a hole in it from a header tube, or wear thru. Also, check for proper modulator valve operation. Also, pull the governor and clean it with carb cleaner. Then, hold it by the gear, with the weights hanging down (gear up, weight end hanging down). Move the weights in and out, and look CLOSELY at the...

Da Torquester. replied 1 year, 8 months ago
Quote: Originally Posted by Yardley I just put a wicked 3800 stall Coan converter in my Riv. The car is now unreal. It launches so hard! I love it! But... What I really hate is this: when I slow down to a very slow speed in traffic or to make a turn, the trans just won't pull down into 2nd gear. It hangs in 3rd gear, and ...

12lives replied 1 year, 8 months ago
Yards - try calling Chris 718-784-4256 or 631 218 1989 at CK Performance - they are pretty helpful and may have a suggestion. - Bill

evil16v replied 1 year, 8 months ago
Quote: Originally Posted by Jim Rodgers Jeff, Check the rubber line that goes to the modulator valve. It very well could have a hole in it from a header tube, or wear thru. Also, check for proper modulator valve operation. Also, pull the governor and clean it with carb cleaner. Then, hold it by the gear, with the weights ...

Yardley replied 1 year, 8 months ago
Thanks all. This is an issue that only surfaced the minutes I installed the converter. I changed the fluid and filter last night. The fluid smelled burnt. I hope I didn't burn the fluid as soon as I fired it up with that small converter. As much as it slips I can assume it will generate a lot more heat??? The governer may have had a sticky valve. So I cleaned it real good and put ...

DaWildcat replied 1 year, 8 months ago
Yards, how big is your external trans cooler? Devon

LARRY70GS replied 1 year, 8 months ago
Yards, Call Coan, it shouldn't feel like it slips that much. It probably needs an adjustment. They will make it right.

GranSportSedan replied 1 year, 8 months ago
Quote: What I really hate is this: when I slow down to a very slow speed in traffic or to make a turn, the trans just won't pull down into 2nd gear. It hangs in 3rd gear, and when I accelerate to get up to traffic speed (like to 35 or 40 MPH) it really winds the motor and the car pretty much doesn't go anywhere as the conveter is slipping (like it is supposed to do)....

 

Top contributing authors

Name
Posts
Yardley
20
user's latest post:
New converter, now trans is weird
Published (2008-04-10 12:53:00)
Quote: Originally Posted by Geoemojr You must make a lot of cash to blow close to 1 grand on a converter. It's not what you earn, it's what you keep. A little life lesson for y'all there.
LARRY70GS
8
user's latest post:
New converter, now trans is...
Published (2009-08-24 13:32:00)
Quote: Originally Posted by Ken Warner Old thread but what was the final conclusion to this? thanx Ken, I believe he finally got the correct converter from Coan. His car went 12.99 at Cecil County last year so it worked.
69GS400s
7
user's latest post:
New converter, now trans is...
Published (2009-11-16 12:38:00)
Nice Times GrandVille !! Any links to threads with your motor / car buildup ?
buick64203
6
user's latest post:
New converter, now trans is weird
Published (2008-04-07 22:04:00)
Quote: Originally Posted by 71GSX455-4SPD Sled? That's more like a brick. I hear it handles like a piece of american cheese on a tile floor.
kick71
5
user's latest post:
New converter, now trans is weird
Published (2008-04-10 16:16:00)
Well said Yardly!
D-Con
4
user's latest post:
New converter, now trans is weird
Published (2008-04-06 12:07:00)
Try calling Coan. Don't they give you one free re-stall or something like that? They have way too good a reputation to believe they won't make it right. If you filled out the tech-sheet properly (which I am sure you did) then they should be able to either fix the converter you have to do what you want, or replace it with the proper one. (after explaining why they gave you what they did, or say "oops, what were we...
Jim Weise
4
user's latest post:
New converter, now trans is weird
Published (2008-04-07 11:33:00)
Quote: Originally Posted by Yardley So why would the Coan guy tell me I need a $915 custom made race converter?????? Was I taken advantage of?????? ...*picking myself up off the floor*... Yards... they up-sold you something you did not need, simple as that. And to add insult to injury, they didn't bother to take into account that you have a BBB, not a BBC. Torque production at rpm is considerably different between the two motors, and...
DaWildcat
4
user's latest post:
New converter, now trans is weird
Published (2008-04-06 08:37:00)
I toasted mine back in the '80's after raising the high stall on my switch pitch. Remember back when Kenne-Bell said you didn't need an external cooler for vp? Added a small external cooler, promptly toasted it again. I now run a temp gage, bigger external cooler and have bypassed the trans cooler in the radiator. Lessons learned - The small cooler wasn't enough for my driving habits Not having a gage meant I had no idea...
71GSX455-4SPD
4
user's latest post:
New converter, now trans is weird
Published (2008-04-10 12:25:00)
Quote: Originally Posted by Geoemojr You must make a lot of cash to blow close to 1 grand on a converter. Shhhh! Keep it down. The marital unit may have spies on this site!
APVGS
3
user's latest post:
New converter, now trans is weird
Published (2008-04-07 10:34:00)
Quote: Originally Posted by Yardley I just looked over their products on their webpage. I am not happy about this. They have a REALLY nice 10" "Competition Series" converter that will do everything I need and only cost me $495. So why would the Coan guy tell me I need a $915 custom made race converter?????? Was I taken advantage of?????? I think there was a "miscommunication" somewhere..maybe this point should be...

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