Overdrive transmission

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Nihms

Nihms

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Looking for recommendations on a OD transmission for my 67 Barracuda that has a 360 in it currently, but plan to turn it into a 408. The transmission in there now is a 727.
 
46rh out of an early 90s 2wd Dakota , Ram or van. Bolts up to block but will need some tunnel fab and a shorter drive shaft . I just picked one up for my 68 Fastback.
 
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I will be using the 42RH (904 version) behind a basically stock 66 273/235 Charger 273 in my 65 Dart panel wagon with modified tunnel/floorpan. The transmission crossmember is a modified 67-up part with a universal insulator. Also using the kit from PATC as well.
 
Turbo TH200-4R? That's what I plan to go with for my daily driver. It will be behind a fairly mild 300hp 318 until I can collect all the parts for a Gen III Hemi conversion. Luckily, the trans will work with both.
 
I'm going to be putting a Tremec T5 in my 64 valiant soon. Just one more option.
 
there are multiple threads here on the A500 (42RH), and A518 (46RH) overdrive Torqueflites here, It's not a bolt in but compared to the work needed for other options, it seems quite reasonable. Got my A500 cranked up last week, so far so good.
 
A500/RH42 or A518/RH46 both are good options, the gear vendors unit hasn't got nearly as much of a step going into O/D...
As far as whether to choose an A500 or an A518 if your making more than 450 HP I'd definitely go with the A518 but if less than that either works but I'd go with the A500, it's a little smaller so it fits better, it's a little lighter which is a good thing & most important it's got a deeper first & second gear... It also uses less HP..

A500 A518
1st 2.64 2.45
2nd 1.54 1.45
3rd 1.00 1.00
O/D .69 .69

What that means is the A518 would need more gear to launch the same as the A500

A500 with 3.55 gear 1st gear is 9.37
A518 with a 3.55 gear 1st gear is 8.69
A518 with a 3.91 gear 1st gear is 9.57

So to match the launch of the A500 the A518 needs nearly a 3.91 gear and honestly to make up for the HP used probably every bit of a 3.91.. Which hurts the highway RPM's... Though honestly not enough to be overly concerned... If you have an A518 use it.. But if you have both I'd look real hard at that A500..
 
Furious65 said:
Turbo TH200-4R? That's what I plan to go with for my daily driver. It will be behind a fairly mild 300hp 318 until I can collect all the parts for a Gen III Hemi conversion. Luckily, the trans will work with both.
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Never been a fan of putting a GM trans in a Mopar......
 
1WildRT said:
A500/RH42 or A518/RH46 both are good options, the gear vendors unit hasn't got nearly as much of a step going into O/D...
As far as whether to choose an A500 or an A518 if your making more than 450 HP I'd definitely go with the A518 but if less than that either works but I'd go with the A500, it's a little smaller so it fits better, it's a little lighter which is a good thing & most important it's got a deeper first & second gear... It also uses less HP..

A500 A518
1st 2.64 2.45
2nd 1.54 1.45
3rd 1.00 1.00
O/D .69 .69

What that means is the A518 would need more gear to launch the same as the A500

A500 with 3.55 gear 1st gear is 9.37
A518 with a 3.55 gear 1st gear is 8.69
A518 with a 3.91 gear 1st gear is 9.57

So to match the launch of the A500 the A518 needs nearly a 3.91 gear and honestly to make up for the HP used probably every bit of a 3.91.. Which hurts the highway RPM's... Though honestly not enough to be overly concerned... If you have an A518 use it.. But if you have both I'd look real hard at that A500..
Click to expand...
I was under the impression the A500/42RH first gear ratio was 2.74. Maybe it's a typo?
 
supertruck said:
200-4R in my '73 Sport. Love it.
Click to expand...
MUCH stronger than they're given credit for. That's the transmission General Motors put in the 3.8L Grand National turbo cars of the eighties. The standard 200 passenger car transmission isn't very strong, but when upgraded with the turbo car gear sets and stronger parts, they are plenty strong. They're small too which means more power to the ground.
 
The 200 started in about 76. It was a three speed. It became the 200c with the advent of the lockup converter. The 2004R was the 200c with overdrive added.
 
RustyRatRod said:
MUCH stronger than they're given credit for. That's the transmission General Motors put in the 3.8L Grand National turbo cars of the eighties. The standard 200 passenger car transmission isn't very strong, but when upgraded with the turbo car gear sets and stronger parts, they are plenty strong. They're small too which means more power to the ground.
Click to expand...
It can handle 550 hp, that’s pretty impressive.
 
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