transmission for 70 help
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Senior User
Joined: Jul 2006
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From: Hesperia, So Cal
transmission for 70 help
hey guys, i need to know what the manuel 4 spd trans was called for a 1970 f250 w/390, im doing a trans swap from auto to man, and dont know what the mauel was called, Dustin
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Post Fiend
Joined: Dec 2003
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From: "Islander"
The lowest ratio in first would be a 435 box, all are synchro 2-3-4 not first but a T-19 box has synchro first. The gear spacing is wide on these boxes.
You'll have to locate manual truck pedal assembly with linkage bell housing and flywheel. Unless your on a tight budget I would install a TKO 5 speed, come in 500 and 600 ft/lb torque rating and bolts up without a adapter plate to bell housing, no butchering to fit with full input to pilot bushing support Rear trans mount and driveshaft will have to be altered.
If your pulling a lot of weight a longer stroke would help like a 428 crank.
.....=o&o>.....
You'll have to locate manual truck pedal assembly with linkage bell housing and flywheel. Unless your on a tight budget I would install a TKO 5 speed, come in 500 and 600 ft/lb torque rating and bolts up without a adapter plate to bell housing, no butchering to fit with full input to pilot bushing support Rear trans mount and driveshaft will have to be altered.
If your pulling a lot of weight a longer stroke would help like a 428 crank.
.....=o&o>.....
Posting Legend
Joined: Sep 2001
Posts: 30,255
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You will need to find the appropriate bellhousing for your engine. The T-19 with 4 gears synchronized will be difficult to find. It was used in school buses and bread trucks etc. The 1st gear in it was not as low as the unsynchronized granny gear found in the T-18 & NP435.
Thread Starter
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Senior User
Joined: Jul 2006
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From: Hesperia, So Cal
ok then, will the t-18 work? will it bolt to the FE 390, im on a budget, i want the four speed.....which do you think is better for pulling 15k lbs+ the t-18 or the np435?
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Post Fiend
Joined: Dec 2003
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From: "Islander"
With the weight your pulling a 435 would be better with the lower 1st gear.
If you find a sloppy shifter which most are with that aluminum top buy a new top and shift lever. T-19's can be found in 3/4 and 1 tons but not that common. Replace that rear 7 ball bearing with a 11 ball, it will last longer.
I recall it was a 308L bearing as I went thru a dozen of 'em in 840 plus K miles.
Install new fork pads, input bearing then check the synchro clearances.
.....=o&o>.....
If you find a sloppy shifter which most are with that aluminum top buy a new top and shift lever. T-19's can be found in 3/4 and 1 tons but not that common. Replace that rear 7 ball bearing with a 11 ball, it will last longer.
I recall it was a 308L bearing as I went thru a dozen of 'em in 840 plus K miles.
Install new fork pads, input bearing then check the synchro clearances.
.....=o&o>.....
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Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
Dustin, I am concerned about the weight that you are wanting to pull and stop with your 4 wheel truck. 15,000lbs is way past the limits of the truck. IMHO
You are talking over 20,000lbs combined weight, for a 35 year old truck.
I will admit to being OK with a one time pull of that much weight under guarded conditions, but not for regular work.
my 2 cents
John
You are talking over 20,000lbs combined weight, for a 35 year old truck.
I will admit to being OK with a one time pull of that much weight under guarded conditions, but not for regular work.
my 2 cents
John
Post Fiend
Joined: Dec 2003
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From: "Islander"
Add a big cooler after the radiator cooler then add a frame mounted spin-on filter with magnet before sending back to the tranny.
The torque multiplication factor of the torque convertor on takeoffs is very high as well heat buildup.
What rear gears you running and braking on the trailer?
Truck bed going to have weight at the tailgate when towing to prevent trailer controlling truck, not a good thing seeing trailer passing you.
Sounds like a job for a F350 with duals.
.....=o&o>.....
The torque multiplication factor of the torque convertor on takeoffs is very high as well heat buildup.
What rear gears you running and braking on the trailer?
Truck bed going to have weight at the tailgate when towing to prevent trailer controlling truck, not a good thing seeing trailer passing you.
Sounds like a job for a F350 with duals.
.....=o&o>.....
Fleet Owner
Joined: Jun 1999
Posts: 24,552
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From: Creedmoor, North Carolina
Dustin, Don't mean to be mean, but I have to agree with B-nut, a 15,000 tow is a F350 dually job.
Should you have an O-Sheet moment the larger truck could save your life. IMHO
John
Should you have an O-Sheet moment the larger truck could save your life. IMHO
John
Post Fiend
Joined: Dec 2003
Posts: 6,658
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From: "Islander"
This brings up the question, when do the Troopers or highway Patrol draw a line between a safe or unsafe tow weight vs tow vehicle? Years ago I moved a 295,000 pound gondola full of gravel 500 yards up the tracks. First gear was wheel spin as I didn't want to hurt the clutch as the 12.00 16.5's were shot anyway. better to release energy and spin than break things, after that Mr. 435 made noise as that 308L bearing was wounded again. The 414 can hurt 435 boxes I don't care how strong people say they are. Sure ticked off a GMC boy as he couldn't get the gondola rolling from static not alone I went into 3rd gear. In reality rail cars are easy to move just take your time.
I see it all the time where I live on an island where a Toyota 1 Ton (1) pulling a 28' boat to the boat ramp and the boat alone weighs 16,000 pounds less trailer. Must be one of those YEN ratings they use?
.....=o&o>.....
I see it all the time where I live on an island where a Toyota 1 Ton (1) pulling a 28' boat to the boat ramp and the boat alone weighs 16,000 pounds less trailer. Must be one of those YEN ratings they use?
.....=o&o>.....
Last edited by jowilker; Sep 28, 2006 at 10:40 PM.