did you contact Bob about it?

 

Daz:

Yeah, it was Chris I talked to.

It's going in on Monday - should be OK - was supposed to be today but I'm going to change the rad over the weekend.

Have to decide whether to get rid of that converter - probably be a good idea as it's been suspect before.

I was looking at a TKO swap there for awile but all that will have to wait - too much $.

George

 

did you consider the non-lockup version of your tranny?It seems like those lockup TH350's are not as strong.Either that or 700R4..i dunno

 

You might be right about the lockup converter being weaker although it was vibrating a bit behind the LG4 and at that time I thought it was the DS as the tranny had just been rebuilt. In fact the DS was bad but it's been rebuilt this year.

It's built TH350 though - should be stronger than a 700 - and more than enough for what I do. Fluid is good and it was shifting OK - something just broke. Could have been caused by the vibration.

TH350 was only ever suppose to be a stop gap until I could afford a Tremec although I thought the last rebuild would be bullet proof so I was thinking of leaving it as an automatic. Anyway, this too will pass..lol - maybe I should sell it and join LS1 crew over on nefourthgen..lol

I was at the Mosport GP Track last Monday but didn't run because of the vibration problem and it was raining so I f'ucked off back to TO. The tranny went out the next day so it would have failed for sure at the track resulting in a nice towing bill and who knows what else - so, things could have been worse.

 

For anyone who's interested (I'm betting this topic doesn't come up alot around a 3rd gen. board). The TH-350C (lockup version) is slightly lighter/weaker than ALOT (not all) of the non-lockup TH-350s before 1981. The 350C is 'on par' with the V6-destined TH-350s - i.e. less frictions in the clutch pack and a slightly lighter casing. V8 TH-350's (non lockups again) were a slight bit heavier and had one extra friction in the clutch pack.

A TH-350C in stock form is slightly stronger than a 700-R4 in stock form ("700-R4"- by the time they were known as 4L60's and being put behind LT1's- this wouldn't necessarily be the case). I'm sure everyone likes to think "their" transmission- i.e. 700-R4's for thirdgen f-bodies- is a fantastic piece of work- but it's pretty low on the list for performance use/durability. Any TH-350/TH-350C, TH-400, TH-200-4R or 4L80E is buildable to be stronger than a "built" 700-R4 for the same, or less, money. Sure- let the flaming begin- but the 700 was not a great design- it was an 1980s quicky design (that improved after 1987) that GM flogged for too long before making more changes in the early 1990s- if you actually pull apart a TH-350C, a 200-4R and a 700-R4 side-by-side-by-side- the 700 uses all the worst elements/design features of the other two. Not trying to be funny- it's just the way it is/was. The TH-350C is not a bad unit- and if upgraded can be respectable. Although if you plan on beating the thing to death I'd suggest getting a $50.00 TH-350 V8 (non lockup) core and having it rebuilt/"built"- I have a tough time thinking any LG4 could kill a 350 if its not being maltreated (high speed neutral drops, switching from R to D while still moving, etc.) Don't know the current market rate on TH-350 rebuilds- but I'm betting you could get quite a respectable unit w/core charge done for somewhere around a grand plus the cost of a decent converter.

 

Roller clutch was broken - it didn't like the new motor I guess.

Converter was balanced to w/in 4 grams so it's unlikely to have caused the vibration

It was running a bit hot with the old rad so I installed a new direct fit rad from Crap Tyre and a 160 stat thinking that would run about 180. I know that changing the stat doesn't necessarily fix cooling problems but sometimes it helps a bit. Now it's running too cool - have to put the 180 stat back in..lol

 

He wasn't there when they did the first rebuild.

I talked to him when I took the car in on Monday and he's doing the work on it - seems really knowledgeable.

 

did they check the lockup operation..Cause if its locking up at the wrong RPM(too low) or not releasing it would cause a vibration

 

It wasn't locking up. They're going to look at that.