CRT big block 518 trans
- Thread starter GTXDAN
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murfman
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Actually he did create something new, it’s a new modular HD SFI approved case and bell housing that will work behind an A block, B block, or Cummins. The cut and welded case is not SFI approved.
furious70
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I see. Useful for drag and drive racers
murfman
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And it’s stronger for the more important Cummins market.
j-c-c-62
Well-Known Member
That was also my first question.
I believe however the new offering is an entire new case and a detachable SFI bellhousing, not like the prototype? pictured., meaning that large flange (case to bellhousing) that required sheet metal modification is no longer a concern.
themechanic
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Cope responded with the price in the video comment section.
$2200
$2200
Sounds like a 1 piece. The whole case would be sfi. Bye bye tranny blankets and shields.
j-c-c-62
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Well then it would be big block specific, not favorable IMO. I am basing my assumption on the video that noted the new bolt location without the flange eliminated sheet metal clearancing, if I heard his comments correctly.
Ok thanks maybe that's the deal.
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The Silver Sport Overdrives A41 kit is a GM based 4 speed automatic overdrive. At it's core is a 4L60E, an electronic version of the 700R4.
This was a decent transmission for lower performance applications and it is compact enough to fit our cars with only minor clearance work. The kit was over $6000 the last time that I looked at it but it was made to bolt right in.
Now, this new 518 casting has a similar overdrive ratio as the GM trans but the 518 first gear is sure more drag race oriented than the GM. A 2.45 1st gear is way behind any modern automatic. You have to run a deeper gear to get the car moving and while the overdrive does take the sting out of the low axle gear, it still could be better.
This was a decent transmission for lower performance applications and it is compact enough to fit our cars with only minor clearance work. The kit was over $6000 the last time that I looked at it but it was made to bolt right in.
Now, this new 518 casting has a similar overdrive ratio as the GM trans but the 518 first gear is sure more drag race oriented than the GM. A 2.45 1st gear is way behind any modern automatic. You have to run a deeper gear to get the car moving and while the overdrive does take the sting out of the low axle gear, it still could be better.
murfman
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It’s a 2 piece and it is SFI
68-500
Well-Known Member
If a man wanted he could opt for the lower 2.75 gearset in the A518. Nice middle of the road gear between the pickup truck ratio GM trans and the factory 2.45 ratio.
furious70
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Is the sfi 518 case available for sb/Gen III hemi? Should be the same as Cummins, right?
j-c-c-62
Well-Known Member
I have not yet read that it is, however, that would I suspect be the logic for having a bolt on bell housing vs an integral BB case/bellhousing.
It's likely only a matter of time, or avoiding the Passion 5speed saga?
It's likely only a matter of time, or avoiding the Passion 5speed saga?
68-500
Well-Known Member
Cummins is a bellhousing all to itself.
1 Wild R/T
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But Mopar made a case for the Cummins... Extra clutches & six pinion planeteries front & rear plus O/D... Called it the 618...
furious70
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Ah, for some reason I thought they were the same as sb. No reason for that to have even been true though.
So still the question is sfi 518 case for sb/Gen III?
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It would make sense if they designed a case to use a bolt on bell that the case itself would be universal. I didn’t read where it was…. But it would make the most sense. Then you could have just one main case to fit whatever you want…Mopar big block, small block, slant six if you really thought you needed it.
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