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Re: Anyone regret removing their GV overdrive?
[Re: Kern Dog]
#1660934
09/05/14 02:09 AM
09/05/14 02:09 AM
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Joined: Feb 2010
Posts: 18,493
Granite Bay CA
Kern Dog
OP
Striving for excellence
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OP
Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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I went ahead and removed the unit. I made a deal to sell the GV with all of the extra parts to a fellow Moparts member. I sold it for about $1000 less than new which both the buyer and I feel is a fair deal. I took a 742 case 8 3/4" chuck to my local axle guy. He is going to rebuild the clutch type diff, replace all the bearings and put in a fresh set of 3.55 gears. I've had 4.10s and 3.91s that both developed a whine at freeway speeds. They were original OEM gears so I hope to have better luck with brand new stuff. I've ran a set of 3.23 gears that were as quiet as new so I know that it can happen. I've tried to make the car a better driver. The FatMat sound deadening doesn't eliminate gear whine very much. We build these cars to drive, not to sit in the garage looking pretty. 
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Re: Anyone regret removing their GV overdrive?
[Re: Kern Dog]
#1660935
09/05/14 05:19 AM
09/05/14 05:19 AM
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Joined: Mar 2007
Posts: 3,287
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,287
West Coast, USA
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Quote:
I went ahead and removed the unit. I made a deal to sell the GV with all of the extra parts to a fellow Moparts member. I sold it for about $1000 less than new which both the buyer and I feel is a fair deal.
I took a 742 case 8 3/4" chuck to my local axle guy. He is going to rebuild the clutch type diff, replace all the bearings and put in a fresh set of 3.55 gears. I've had 4.10s and 3.91s that both developed a whine at freeway speeds. They were original OEM gears so I hope to have better luck with brand new stuff. I've ran a set of 3.23 gears that were as quiet as new so I know that it can happen. I've tried to make the car a better driver. The FatMat sound deadening doesn't eliminate gear whine very much.
We build these cars to drive, not to sit in the garage looking pretty.
You will never be happy with your car until you put a good 4 speed automatic with a high quality lock-up torque converter in your car. And no, you don't need to remove the torsion bar crossmember at the transmission tunnel. A 200R4 with a Powerglide Bellhousing is one way to go. 2.76 to 1 1st gear and a .67 overdrive. You will have to notch the crossmember on the driver's side, reinforce it a bit and build your own Bolt-on rear engine mount though, and if you paint it black, no one will know what it is under there.
The Fat Mat is a good start, but if you want noise reduction, you have to seal the entire inside of the car with a product like "The Insulator" from Aircraft Spruce. It makes a night and day difference in the sound in the car.
I have guys who own e-bodies loaded with Dynamat extreme or Fat mat sit in my car and close the door. Their mouths usually drop open when they hear the difference. It's like sitting inside an sound room chamber or a vault.
I have 4 or 5 bulk packs of Dynamat Extreme in my car too, but all it does is stop the panels from resonating and reflect a little heat....for a while. It's the Insulator with fully taped seams that really deadens the sound both inside and from outside the car, fumes and heat too.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: Anyone regret removing their GV overdrive?
[Re: gdonovan]
#1660938
09/05/14 04:16 PM
09/05/14 04:16 PM
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Joined: Mar 2007
Posts: 3,287
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,287
West Coast, USA
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Quote:
Quote:
518 in a mopar =
Actually since that is my car and picture I can tell you that is a 42RH/44RH not a 518. The overdrive units are the same but the case around the main body isn't as bulky.
Think 904 vs 727.
Great information. Thanks for documenting it. Which ever way you go, overdrives in these old Mopars, when done well and when the crossmember area is reinforced properly are so much more of a pleasure to drive on the freeway.
While I wouldn't want to cut out my crossmember on my 1970 #'s car, I would bolt a Passon 5 speed in it.
The bottom line is it's not all that hard to do a good job installing the overdrive of your choice if your have the tools, shop and inclination to learn from those who have forged the path ahead of us. Thanks for sites like Moparts and A-bodies only for being a treasure trove of information on so many things that are Mopar!
The only other reported issues with the 500 & 518's is they take significantly more power to turn and require more room to fit in these old cars than some alternatives out there, because the overdrive unit is essentially added onto the back of their 904 & 727 transmissions.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: Anyone regret removing their GV overdrive?
[Re: jbc426]
#1660939
09/05/14 04:50 PM
09/05/14 04:50 PM
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Joined: Jan 2003
Posts: 2,931
Paul_Fancsali
master
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master
Joined: Jan 2003
Posts: 2,931
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I still get 14mpg with a holley and 4.10s and short 24 tall tires. So what if it holds 3000 if its built right it should be no problem. I ran 4.30s and 4.56s on highway and never cared over 5 years kept me right at 65 the speed limit and the shot to over 100 is real quick what the use in owning a hanger queen!
By the way if its not broke you will break it when you mess with it
Last edited by Paul_Fancsali; 09/05/14 04:52 PM.
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Re: Anyone regret removing their GV overdrive?
[Re: gdonovan]
#1660942
09/05/14 09:24 PM
09/05/14 09:24 PM
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Joined: Jan 2003
Posts: 3,575
The Netherlands
BigBlockMopar
master
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master
Joined: Jan 2003
Posts: 3,575
The Netherlands
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Quote:
Quote:
The only other reported issues with the 500 & 518's is they take significantly more power to turn
That is the rumor but I have not seen a shred of documentation that supports it besides "one vendor said so" or mention of someone going from a near stock OD trans to a wild race 727 with a good racing converter.
I felt a def. loss of power when going from a 906 to an A518 in my '73 dailydriven Dart. (2bbl 318, 8.6:1 CR)
Part of this however could also have been caused by the (more inefficient?) 60's 12" stallconvertor I used.
After I swapped over to an A518 with lockup later on, I had to use the matching 90's convertor which, perhaps by being a full inch smaller in diameter, seemed to let the bone stock 318 rev quicker.
My car did 14-17 mpg at the time with the bone stock driveline - 904 & 7-1/4" rearaxle.
Now I'm driving around with a A518 OD+LU and a 3.91 geared 8-3/4", but can't get over 14 mpg easily.
Just last week I installed 3.55 gears to hopefully get some better MPG's.
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Re: Anyone regret removing their GV overdrive?
[Re: Twostick]
#1660943
09/05/14 10:01 PM
09/05/14 10:01 PM
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Joined: Feb 2010
Posts: 18,493
Granite Bay CA
Kern Dog
OP
Striving for excellence
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OP
Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Quote:
So you're going from a 3.05 final drive ratio to a 3.55 and giving up the flexibility of 6 gears for??? 
Kevin
The whole "gear splitting" thing makes no sense to me. Nobody is fast enough to shift the GV in and out of OD to take advantage of gear splitting when under full throttle. If I were driving a big rig, I could see its advantages there.
My point was that 90% of my driving is here locally. I make one, maybe two trips per year from Sacramento to Los Angeles. The 3.05 final drive was nice, I'll admit but the high stall converter made the car feel lazy at freeway speeds. I bought an 11" converter from Lenny at Ultimate Converter. If the car doesn't get 10 mpg on the freeway, I could always swap in a 3.23 or a 2.94 for my trips to L.A.
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Re: Anyone regret removing their GV overdrive?
[Re: Kern Dog]
#1660946
09/06/14 12:32 AM
09/06/14 12:32 AM
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Joined: May 2003
Posts: 6,568
Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,568
Downtown Roebuck Ont
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Quote:
Quote:
So you're going from a 3.05 final drive ratio to a 3.55 and giving up the flexibility of 6 gears for???
Kevin
The whole "gear splitting" thing makes no sense to me. Nobody is fast enough to shift the GV in and out of OD to take advantage of gear splitting when under full throttle. If I were driving a big rig, I could see its advantages there.
My point was that 90% of my driving is here locally. I make one, maybe two trips per year from Sacramento to Los Angeles. The 3.05 final drive was nice, I'll admit but the high stall converter made the car feel lazy at freeway speeds. I bought an 11" converter from Lenny at Ultimate Converter. If the car doesn't get 10 mpg on the freeway, I could always swap in a 3.23 or a 2.94 for my trips to L.A.
You need a ratchet type shifter or slap stick and the button needs to be on the shifter to split them smoothly. GV sells shift knobs with the switch built in. For drag racing you usually only split 2nd.
I would have gone with a 4.10 or 4.30 gear if the engine wasn't happy with the 3.05 final and kept the GV. My 493 wasn't happy with 2.76's and a 28" tire but it works well with 3.23's which is about where a 4.10 would put it with a GV. The GV I have is for a 700R4. I'm still looking for a 727 adapter housing for it.
Kevin
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