93 4mula

iTrader: (-1)

Ok well I ended up getting a TH350 from my buddy today. Its brand new 0 miles and built with all kinds of B&M stuff, Shift kit etc. I am going to most likely send it in and get it built a lil more extreme with a trans brake and stuff. Well now my question is what else do I need to get. What flywheel is the best to go with for a 750-800hp motor (N20), Will my orginal starter I have now still work with this tranny, its a jegs mini torque starter with universial pattern.. I know I need a different driveshaft now, and obvisiously its gonna be shorter right? Anyone know what length I need, or what brand would be best for my setup? Also do they make any aftermarket crossmembers that will bolt up to my car (93 Bird) and the th350? And what do I do about mounting the torque arm now?

foggedz

iTrader: (1)

I would do a search in the Automatic section of the site. Thats where I got all the info I needed.

rockcamaro97

Ill hit the questions in order.

TCI makes an SFI approved LT1 flexplate that works with the stock starter. LT1's have a different tooth count from std SBC's and also have a counterweighted flexplate. I see youve built a 383 so depending on how your engine was balanced will determine if you use a LT1 specific or SBC flexplate.

The starter bolts to the engine and I see no reason it wouldnt work. Im using a stock starter with my th350.

DO you need a new DS? my stocker worked fine, but there are different Th350 with different tailshaft lengths. I have a short tailshaft th350 which is most desirable for using in an F car.

Dunno about the crossmemeber, mines a modded stock.

Buy a short Torque arm like spohn's.

Matt

lt1taracing

i used the same starter when i changed mine over. also the same flywheel. i also used the stock crossmember. i moved it up and only used two bolts instead of four, with no other modification to it. i did have to have a torque arm bracket made. although, if you use a diff. type torque arm that doesnt attach to the trans. then you wouldnt have to buy the bracket. i run a jeg's adjustable that bolts to the trans. tunnel of the floor pan. i also use an aftermarket shifter( b&m proratchet). i dont remeber my driveshaft lenth but it is diff. with a short tailshaft turbo350.

93 4mula

iTrader: (-1)

I think I have the short tailshaft on mine. Does anyone know the measurement of the short tail? BMR makes and aftermarket tranny cross member with a torque arm relocation mount for a th350. So this crossmember will eliminate my crossmember issure right? Heres a link to it..
Also my bottem end was internally balanaced from Eagle. So which flexplate do I need to get internal or external?



http://www.bmrfabrication.com/misc/TCC013.jpg

Fire67

iTrader: (3)

First, Lt1 flexplates are no different from any other SBC. They are 153tooth stock... A 168tooth will work with the appropriate starter,
For the fewest issues, stay with the stock type starter/flexplate combination (153tooth). You need an SFI certified 153 tooth flexplate setup for a 1pc rear main seal engine, internally balanced.

Yes, that BMR crossmember will solve your mounting problems.

Short tail Th350 or not, they are slightly different in length than a 4L60 or T56, you will need a different driveshaft. Spohn.net sells them setup for your trans and rear end choices.

foggedz

iTrader: (1)

There are 3 different style tail shafts that th350s were made with: 6in, 9n, and 12in . If you have the 9in tailshaft and the stock rearend you can use a stock driveshaft. I bought a LS1 drive shaft and put it in during my TH350 swap.

93 4mula

iTrader: (-1)

Sweet. I appreciate the help. So since my bottom end is internally balanced straight from Eagle then Ill want an Internally balanced flywheel? Someone told me that I needed to get a Nuetral Balanced flywheel??

CNC Stew

Neutral balanced flexplates are used with internal balanced motors.

Counterweighted flexplates are used with external balanced motors.

93 4mula

iTrader: (-1)

Well I know that when I bought my kit that it was internally balanaced from Eagle. You could tell cause the crank had been drilled into in some spots etc.. So then I need a Neutral Balanced flywheel? So I basically just get a flywheel and cut the weights off of it right?

Shon Herron

iTrader: (25)

Have you done a search?
This topic has been done several times, I know I have posted in several of them with good info.....