6.0 to TH350 mating question
#1
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Join Date: Jan 2013
Location: Saskatchewan, Canada
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6.0 to TH350 mating question
I am trying to maintain a budget so I will be keeping the stock transmission in my 70 firebird. The '06 LQ4 I bought came with a 4L80E flex plate, So I was wondering what I would all need to bolt it up to my TH350?
SIDE NOTE: The car currently has a BOP TH350 and I know the LS based engines use a chevy bolt pattern. Will the Chevy TH350 bolt directly in place of the BOP TH350?
SIDE NOTE: The car currently has a BOP TH350 and I know the LS based engines use a chevy bolt pattern. Will the Chevy TH350 bolt directly in place of the BOP TH350?
#6
is the flywheel dished ,, if so you need this
http://www.ebay.com/itm/New-Speedway-LS-Crank-to-GM-TH350-400-Converter-Sleeve-Adapter-4mm-Centerplate-/381141324137?pt=Vintage_Car_Truck_Parts_Accessories&hash=item58bdcb1169&vxp=mtr
if its flat you need this
http://www.ebay.com/itm/700R4-Early-4L60E-Adapter-to-install-a-LS1-motor-/130944454153?pt=Motors_Car_Truck_Parts_Accessories&hash=item1e7ce5ce09&vxp=mtr
you also need to elongate the converter bolt holes toward the center of the flexplate approximately 1/8 of an inch ,,, a rattail file works well for this purpose
http://www.ebay.com/itm/New-Speedway-LS-Crank-to-GM-TH350-400-Converter-Sleeve-Adapter-4mm-Centerplate-/381141324137?pt=Vintage_Car_Truck_Parts_Accessories&hash=item58bdcb1169&vxp=mtr
if its flat you need this
http://www.ebay.com/itm/700R4-Early-4L60E-Adapter-to-install-a-LS1-motor-/130944454153?pt=Motors_Car_Truck_Parts_Accessories&hash=item1e7ce5ce09&vxp=mtr
you also need to elongate the converter bolt holes toward the center of the flexplate approximately 1/8 of an inch ,,, a rattail file works well for this purpose
Last edited by ijimmy; 02-26-2015 at 10:49 AM.
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#8
sawzall wielding director
iTrader: (4)
Since you already have a 4l80e flexplate you can bolt right up to a th350. The BOP th350 has a different bolt pattern and will not bolt up directly it may need a BOP to chevy adapter plate. However, check the trans first as some th350`s were cast as dual BOP and chevy cases, if yours has both bolt patterns your good to go. If your DBW its easiest to hook the kickdown cable directly to the gas pedal, unless you want a full manual valvebody.
#10
Pull your pedal assembly out, go buy a small micro switch and orient it someway that will trigger the switch at WOT.
I had to drill a hole thru the pedal arm and welded a bolt in place to hit the switch on mine.
I had to drill a hole thru the pedal arm and welded a bolt in place to hit the switch on mine.